Answers
2). Scalar
3). Magnitude
4). Components
5). Free body diagram
Related Questions
Is the net force up 0.2 N and down 3 N balanced or not blanced
Answers
Answer:
Not balanced
Explanation:
The force pulling the object up is applying less force than the object pulling down, this means the object will move down
Answer:
Not balanced
Explanation:
AAAAAAAAAH
Heat will flow from object A to object B if:
1 The molecular average kinetic energy of the two objects is the same.
2 The molecular average kinetic energy of A is higher than that of B.
3 The molecular average kinetic energy of B is higher than that of A.
I only
II only
I and III
III only
Answers
Answer:
l and lll
Explanation:
Answer:
II only
Explanation:
For heat to flow from one object to another, there must be a temperature difference between them. Temperature is a measure hotness or coldness of an object or a body.
An object consists of vibrating molecules, thus molecular kinetic energy. The measure of the average kinetic energy of an object is its temperature. Thus, when object A has higher temperature (hotter) than B, heat would flow from A to B.
A 68 kg rock climbers 320 m above the ground the sun is down or up at 1.5 m/s using the ground as a reference point determine the total mechanical energy of
Answers
Using the ground as a reference point the total mechanical energy of the rock climber is 213,621.15 J.
The total mechanical energy of the rock climber is the sum of its potential energy and kinetic energy. Potential energy is the energy an object has due to its position, while kinetic energy is the energy an object has due to its motion.
To calculate the potential energy, we can use the following formula:
PE = mgh
where:
PE is the potential energy (joules)
m is the mass of the object (kilograms)
g is the acceleration due to gravity (9.81 m/s²)
h is the height of the object above the ground (meters)
To calculate the kinetic energy, we can use the following formula:
KE = 1/2mv^2
where:
KE is the kinetic energy (joules)
m is the mass of the object (kilograms)
v is the velocity of the object (meters per second)
Plugging in the values, we get:
PE = (68 kg)(9.81 m/s²)(320 m) = 213,542.4 J
KE = 1/2(68 kg)(1.5 m/s)² = 78.75 J
Therefore, the total mechanical energy of the rock climber is:
ME = PE + KE = 213,542.4 J + 78.75 J = 213,621.15 J
So the answer is 213,621.15 J
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Complete question below:
A 68 kg rock climber is 320 meters above the ground and is moving upward at a speed of 1.5 m/s. Using the ground as a reference point, determine the total mechanical energy of the rock climber.
A car has a velocity of 26 m/s and goes down to 8 m/s as it approaches traffic. Was the some sort of acceleration?
Your answer:
Yes
No
Maybe so
Answers
Answer:
Yes
Explanation:
This is negative acceleration, also known as deceleration where the speed is reduced from high to low at a specific duration.
Justine is ice-skating at the Lloyd Center. What is her final velocity if she accelerates at a rate of 2.0 m/s for 3.5 seconds?
Answers
Answer:
7 m/s
Explanation:
Acceleration, [tex]a=\frac {v-u}{t}[/tex]
Where v and u are the final and initial velocities of the Justine respectively, t is the time taken for Justin to attain final velocity.
Making v the subject then
v=at+u
Taking u as zero then
Substituting 3.5 for t, 2 as a then
v=3.5*2=7 m/s
Neutrons released in a fission reaction can strike other nuclei and cause ______.
Question 16 options:
fusion reactions
chain reactions
radioactive decay
an electron avalanche
Answers
Chain reactions
Neutrons released in a fission reaction can strike other nuclei and cause chain reactions
Explanation:
In nuclear fission reactions, the heavier atoms split into into lighter atoms, releasing neutrons at high velocity in the process. The neutrons hit other heavier atoms in the vicinity and split them too releasing more neutrons. This continuation is called chain reaction. The more the released neutrons the higher the rate of chain reactions. This causes too much energy to be produced at a go until an enormous explosion occurs (like in bombs).
In controlled nuclear fission such as in nuclear reactors, the number of neutrons is controlled so as to prevent the reactor from exploding. A wall that absorbs excess neutrons is used to control the number of chain reactions to prevent the release of too much energy at once.
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Final answer:
Neutrons released in a fission reaction can cause chain reactions, which are sustained cycles of fission that release significant amounts of energy.
Explanation:
Neutrons released in a fission reaction can strike other nuclei and cause chain reactions. This process begins when a neutron collides with a nucleus, such as uranium-235, causing it to split into two smaller isotopes and release additional neutrons. If these neutrons then collide with other uranium-235 atoms, they can cause further fission, perpetuating the cycle. A sustained nuclear chain reaction can lead to the release of large amounts of energy, which is the principle behind both nuclear power generation and the explosive power of nuclear weapons.
How does the gravity which pulls the moon and earth toward each other also affect the ocean?
Answers
the ocean creates tides accosiated with the ocean
The greater the speed of speed gas particles in containers, the
Answers
Greater the collision
Explanation:
The greater the speed of gas particles in the containers, the greater the collision of gases with the container and between themselves.
The speed of gas molecules increases when their kinetic energy increases. This causes a surge in collision between the particles and the wall of the container. A gas is composed of large number of molecules moving at different speeds. When the temperature of gases are increased, they gain more kinetic energy and their speed will increase. This leads to an increase in effective collision between gas particles.Learn more:
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A block of mass m = 75 kg is hanging on a vertical rope of length L = 12 m. What work is done by the
gravitational force when the block swings to a position where the rope makes an angle θ = 40° with
the vertical?
Answers
Answer:
2100 J
Explanation:
Draw a picture. Notice that the rope forms a triangle, where the hypotenuse is L and the height is L cos θ. The height of the mass is h. The total height is L, so:
L = h + L cos θ
h = L − L cos θ
The work done by gravity is force times distance:
W = mgh
W = mg (L − L cos θ)
W = (75 kg) (9.8 m/s²) (12 m − 12 m cos 40°)
W = 2063 J
Rounding to two significant figures, the work done is 2100 J.
A small ball weighs 1.4 N.
gravitational field strength, g = 9.8 N / kg
Calculate the mass of the ball.
Answers
Answer:
0.14 kg
Explanation:
Weight is the mass of an object times the gravitational field strength.
w = m(9.8)
1.4 = m(9.8)
1.4/9.8 = 9.8m/9.8
.14 = m
Final answer:
To find the mass of the ball, the weight is divided by the gravitational field strength, resulting in a mass of 0.143 kg.
Explanation:
To calculate the mass of the ball, we can use the formula for weight (w), which is the gravitational force on mass (m):
w = mg.
Given that the weight (w) of the ball is 1.4 N and the gravitational field strength (g) is 9.8 N/kg, we can rearrange the formula to solve for mass (m):
m = w/g
Plugging in the known values, we get:
m = 1.4 N / 9.8 N/kg = 0.143 kg.
The mass of the ball is therefore 0.143 kilograms.
The thin, narrow structure of the capillaries is well-suited to their function because the capillaries _____.
1. Only carry the liquid portion of blood
2. Transport substances directly to the body cells
3. Require only a small amount of oxygen to function
4. Have the opposite function of arteries and veins
Answers
The correct solution would be 2.
A copper sphere was moving at 40 m/s when it hit another object. This caused all of the KE to be converted into thermal energy for the copper sphere. If the specific heat capacity of copper is 387 J/(kg ⋅ C°), what was the increase in temperature?
0.23 C°
0.81 C°
1.3 C°
2.1 C°
Answers
Answer:
Temperature increase = 2.1 [C]
Explanation:
We need to identify the initial data of the problem.
v = velocity of the copper sphere = 40 [m/s]
Cp = heat capacity = 387 [J/kg*C]
The most important data given is the fact that when the shock occurs kinetic energy is transformed into thermal energy, therefore it will have to be:
[tex]E_{k}=Q\\ E_{k}= kinetic energy [J]\\Q=thermal energy [J]\\Re-employment values and equalizing equations\\\\\frac{1}{2} *m*v^{2}=m*C_{p}*dT \\The masses are canceled \\\\dT=\frac{v^{2}}{C_{p} *2} \\dT=2.1 [C][/tex]
The correct option is d. 2.1°C. The increase in temperature of the copper sphere was approximately [tex]\( 2.1 \)[/tex]°C, which corresponds to answer choice D).
Given:
- Initial kinetic energy (KE) of the copper sphere = [tex]\( \frac{1}{2} mv^2 \)[/tex]
- Specific heat capacity of copper, [tex]\( c = 387 \)[/tex] J/(kg·°C)
The entire kinetic energy is converted into thermal energy, [tex]\( Q = mc\Delta T \)[/tex], where [tex]\( \Delta T \)[/tex] is the increase in temperature.
1. Calculate the initial kinetic energy:
[tex]\[ KE = \frac{1}{2} mv^2 \][/tex]
2. Set up the equation equating kinetic energy to thermal energy:
[tex]\[ \frac{1}{2} mv^2 = mc\Delta T \][/tex]
3. Solve for [tex]\( \Delta T \)[/tex]:
[tex]\[ \Delta T = \frac{\frac{1}{2} mv^2}{mc} \][/tex]
4. Substitute the given values:
[tex]\[ \Delta T = \frac{\frac{1}{2} \times m \times (40)^2}{m \times 387} \][/tex]
5. Simplify the expression:
[tex]\[ \Delta T = \frac{800 \times m}{387 \times m} \]\[ \Delta T = \frac{800}{387} \]\[ \Delta T \approx 2.065 \ \textdegree C} \][/tex]
Rounding to one decimal place, the increase in temperature [tex]\( \Delta T \)[/tex] is approximately [tex]\( 2.1 \)[/tex]°C.
Therefore, the increase in temperature of the copper sphere was approximately [tex]\( 2.1 \)[/tex]°C, which corresponds to answer choice D).
A copper sphere was moving at 40 m/s when it hit another object. This caused all of the KE to be converted into thermal energy for the copper sphere. If the specific heat capacity of copper is 387 J/(kg ⋅ C°), what was the increase in temperature?
a. 0.23 C°
b. 0.81 C°
c. 1.3 C°
d. 2.1 C°
we can see our face clearly on mirror why cant we see our face clear on aluminium or irion plate
I need at least 5 sentence
Answers
Because specular reflection occurs with a mirror, while diffuse reflection occurs with aluminium or iron plate
Explanation:
Reflection is a phenomenon typical of waves (such as light wave), that occurs when a wave bounces off the surface of a certain material, going back into the original medium at a certain angle, without changing speed, frequency or wavelength.
The direction of the reflected ray is given by the law of reflection, which states that:
The incoming ray, the reflected ray and the normal to the surface all lie on the same planeThe angle of incidence is equal to the angle of reflectionDepending on the type of surface, two different types of reflection can occur:
Specular reflection: this occurs when the surface is perfectly smooth. In such a case, all the incoming rays of light hit the surface with same angle of incidence, therefore they are reflected at the same angle. This means that a perfect and clear image of the original object can be formed: this is the case of a mirror.Diffuse reflection: when the surface is not smooth, the imperfections on the surface are such that the incoming rays of light hit the surface at different angles of incidence. As a result, the rays are reflected at different angles to each other, and therefore no clear image of the object is produced. This is the case of aluminium or iron plate.Learn more about reflection and other wave phenomena:
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If 10 calories of energy are added to 2 grams of ice at -30° C, calculate the final temperature of the ice. (Notice that the specific heat of ice is different from that of water.) T.F =
-20° C
-30° C
30° C
40° C
Answers
Answer:
-20°C
Explanation:
ΔQ = m c Δt
here ΔQ is heat supplied which is 10 calories , m is mass which is 2 g , c is specific heat capacity of ice which is 0.5 cal/(g C°), Δt is change in temperature which here is to be calculated.
re arranging the equation we get
Δt = ΔQ/(mc)
= 10/ ( 2 × 0.5)
= 10/1
= 10 C°
final temperature = -30 +10 = -20°C
hence option is A
I NEED HELP BADLY
While driving her car at 40 m/s, Andrea (with a mass of 50-kg) stops short to avoid hitting a squirrel crossing the road. If the seat belt is in contact with Andrea for 0.5 seconds, determine:
a.) Andrea’s initial momentum
b.) Andrea’s final momentum
c.) What is the change in momentum (impulse)?
d.) What is the force that the seatbelt exerts on Andrea?
Answers
Answer:
a) Andrea's initial momentum, 200 kg m/s
b) Andrea's final momentum, 0
c) Impulse, = - 200 Ns
d) The force that the seat belt exerts on Andrea, - 400 N
Explanation:
Given data,
The initial velocity of the car is, u = 40 m/s
The mass of Andrea, m = 50 kg
The time period of deceleration, a = 0.5 s
The final velocity of the car, v = 0
a) Andrea's initial momentum,
p = mu
= 50 x 40
= 200 kg m/s
b) Andrea's final momentum
P = mv
= 50 x 0
= 0 kg m/s
c) Impulse
I = mv - mu
= 0 - 200
= - 200 Ns
The negative sign indicated that the momentum is decreased.
d) The force that the seat belt exerts on Andrea
F = (mv - mu)t
= (0 - 200) / 0.5
= - 400 Ns
Hence,the force that the seat belt exerts on Andrea is, - 400 N
how to do this question
Answers
Answer:
64°
Explanation:
The triangle is an isosceles triangles (both legs are equal to the radius of the circle), so that means the base angles are the same.
Angles of a triangle add up to 180°, so:
128 + 2x = 180
2x = 52
x = 26
∠1 is complementary to the base angle, so:
∠1 = 90 − 26
∠1 = 64
You push a loaded shopping cart 5 meters along the ground with a force of
200 N. What work have you done on it?
O A. 9,000 j
O B. 2,500 j
O C. 2003
O
D. 1,000 J
Answers
Answer:
D
Explanation:
Work done w = force F × distance d
F = 200N and d = 5m
: w = 200 × 5
w = 1000J
how does earths movement through space impact the human experience
Answers
Answer:
In space, astronauts lose fluid volume—including up to 22% of their blood volume. Because it has less blood to pump, the heart will atrophy.Under the effects of the earth's gravity, blood and other body fluids are pulled towards the lower body.
Explanation:
4. How many planets are there in our solar system?
a. 9
b. 8
c. 12
d. 15
Answers
｡☆✼★ ━━━━━━━━━━━━━━ ☾
Since Pluto is a dwarf planet, the correct option is B. 8
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Which formula correctly expresses the property density?
Question 7 options:
(A) D = m/v
(B) D = m*v
(C) D = v + m
(D) D = v/m
worth 50 points answer for 50 points and for a chance for "Brainliest" if i know answer is wrong i will remove
Answers
Answer:A
Explanation: density=mass/volume. Density is the measurement of how much mass is contained in a given volume of an object. It can also be defined as mass per unit volume. Mass is the amount of matter in an object while volume is a measure of how much space an object takes u or occupies
I drop an egg from a certain distance and it takes the egg 3.74 seconds to reach the ground. How high up was the egg?
Answers
Answer:
The height from which the egg is dropped is 68.54 m.
Explanation:
Given:
Initial velocity of egg is, [tex]u=0\ m/s[/tex](Dropped means initial velocity is 0)
Time taken is, [tex]t=3.74\ s[/tex]
Acceleration experienced by egg is due to gravity, [tex]a=g=9.8\ m/s^2[/tex]
The height from which the egg is dropped is, [tex]d=?[/tex]
Now, we use Newton's equation of motion that relates the distance, initial velocity, time and acceleration.
So, we have the following equation of motion:
[tex]d=ut+\frac{1}{2}at^2[/tex]
Plug in all the given values and solve for 'd'. This gives,
[tex]d=0+\frac{1}{2}\times 9.8\times (3.74)^2\\\\d=\frac{1\times 9.8\times 13.9876}{2}\\\\d=\frac{137.078}{2}\\\\d=68.54\ m[/tex]
Therefore, the height from which the egg is dropped is 68.54 m.
is potential energy a vector or scalar quantity
Answers
Answer:
Scalar Quantity
Explanation:
Scalar Quantity
Quantity whose magnitude alone is sufficient to represent it. We can also say that it is an amount that has magnitude but no direction. For example, temperature and volume are scalar quantities.
For this case we have the potential energy and it is defined by the equation:
[tex]E_{p}=m*g*h\\ where:\\m =mass [kg]\\g = gravity [m/s^2]\\h = height [m]\\[/tex]
The above equation only shows us one magnitude, it has no direction, therefore it is a scalar quantity.
In a car crash inertia could cause you to crash into a windshield
Answers
Answer:
yes inertia would cause you to crash into the windshield in an accident
if a ball is thrown with a velocity of 25 m/s at an angle of 37 degrees above the horizontal,evaluate the projectile for it's horizontal component of the velocity
Answers
Answer:100 mph
Explanation:
When an object is thrown in a trajectory path the motion is called projectile motion. The horizontal component for the given projectile motion is 15.04 m/s.
From the projectile motion:[tex]V_x = u\rm \ sin{\theta}[/tex]
Where,
[tex]V_x[/tex] - Velocity in the X-axis
[tex]u[/tex]- initial velocity =25 m/s
[tex]\theta[/tex] = angle of throw = 37 degrees
Put the values in the formula,
[tex]V_x = 25\rm{\ sin} \ 37^o\\\\\it{ V_x} = \rm 25\rm \times -0.64\\\\\it {V_x} = \rm 15.04 \rm \ m/s[/tex]
Therefore, the horizontal component for the given projectile motion is 15.04 m/s.
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A city is considering switching to geothermal power for their electricity needs. Which of the following is an advantage of this plan?
It is commonly used across the entire United States.
It uses less land area than gas power plants.
It uses water to power large turbines.
It in inexpensive to build.
Answers
It uses water to power large turbines.
Geothermal power taps on the energy of natural steam from the earth's lithosphere.
Explanation:
The heat from deep in the the lithosphere heats up underground water into high-pressure steam trapped in within the rocks. Boreholes are sunk to tap on the potential energy of this high-pressure steam to turn large dynamo turbines that convert the steam energy into electricity.
The biggest advantage, moreover, is the fact that this method of electricity generation does not emit greenhouse emissions as compared to gas plants that burn hydrocarbons that release CO₂.
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How hot is the sun in degrees Celsius?
Answers
Answer:
The temperature of the mantle varies greatly, from 1000° Celsius near its boundary with the crust, to 3700° Celsius
hope this helps you!
Final answer:
The Sun has a surface temperature of about 6000 Kelvin, which corresponds to approximately 5727 degrees Celsius. This temperature is much cooler than the Sun's core, which reaches about 15 million degrees Celsius.
Explanation:
Temperature of the Sun
The temperature on the surface of the Sun is approximately 6000 Kelvin (K), which is equivalent to about 5727 degrees Celsius (°C). At its core, the Sun is much hotter, with temperatures around 15 million degrees Celsius. The vast difference in temperature between the Sun's surface and its core can be attributed to the complex nuclear reactions and intense pressures found at the center of this stellar body.
The Sun appears somewhat yellow from Earth due to the scattering of shorter blue wavelengths by nitrogen molecules in our atmosphere, while in space, the Sun would actually look white due to the equal amounts of reddish and bluish light it emits. Students often compare the temperature of the Sun to extreme temperatures on Earth, like the record high in Death Valley, CA, which was 134°F (or approximately 56.7°C).
If you're interested in the conversion between different temperature scales, remember that 0 degrees Celsius is equal to 32 degrees Fahrenheit. The formula to convert from Kelvin to Celsius is C = K - 273.15. Therefore, the Sun's surface temperature in Kelvin can be converted to Celsius by subtracting 273.15 from the Kelvin value.
HELP WILL GIVE BRAINLIEST
Answers
Answer:
The answer is 8 [gr/cubic centimeter]
Explanation:
We know that the definition of the density is defined by the mass of the object or substance divided by its volume.
Therefore:
[tex]density=mass/volume\\mass= gramms, kilograms, pounds\\volume=cm^3, m^3, liters, gallons\\[/tex]
For this problem:
[tex]density =\frac{12}{1.5} \\density=8[grams/cm^3][/tex]
A sound has 13 crests and 15 troughs in 3 seconds. When the second crest is produced the first is 2cm away from the source? Calculate
a. The wavelength
b. The frequency
c. The wave speed
Answers
Answer:
The wavelength will be 4 cm, frequency will be 4.66 Hz and wave speed is 18.6 cm/sec
Explanation:
Given:
No. of crest = 13
No. of trough = 15
Time = 3 seconds
Hence, 1 crest or 1 trough = [tex]\frac{1}{2}\lambda[/tex]
therefore,
13 C + 15 T = [tex]28(\frac{1}{2}\lambda)[/tex]
=[tex]14\lambda[/tex]
Time given 3 seconds
= [tex]\frac{3}{14}s[/tex]
[tex]\nu= \frac{14}{3}[/tex]
[tex]\nu= 4.6 Hz \approx 5 Hz[/tex]
2 cm distance is travelled is time period
[tex]\lambda = 4 cm[/tex]
Again wave will travel in 1 T = 4 cm
wave speed v =[tex]\lambda\times\nu[/tex]
= [tex]4\times\frac{14}{3}[/tex]
= 18.6 cm/s
What is an accurate definition of a heat engine? A. a system that converts mechanical energy into thermal energy B. a system that creates thermal energy from the sun C. a system that converts thermal energy into other useful forms of energy D. a system that disperses mechanical energy into various reservoirs
Answers
Answer:
C
Explanation:
C. a system that converts thermal energy into other useful forms of energy
Answer:
The correct option is C
Explanation:
An engine is a highly organized device that converts a form of energy into another form of energy (usually mechanical energy). A heat engine is a device or an engine that converts heat (or thermal energy energy) into other useful forms of energy (usually mechanical energy). Examples of heat engine include steam engine, internal combustion engine. diesel engine among others.
Which of the following is evidence that supports the particle model of light
Answers
Answer:
White light disperses into full spectrum of color when shined through a prism due to refraction.
Explanation:
This experiment was performed by Isaac Newton when he passed a white light through a glass prism.