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Kinematics
Kinematics is the study of how a body moves. This includes linear motion, angular motion, and rotational motion.
3,459 Questions
How fast mph can you go on snow sleds?
Anywhere from 0 to 205mph.
The average 600 will do 95 in good conditions.
A change in a objects speed has a what effect on its kinetic energy than a change in mass?
A change in an object's speed has a greater effect on its kinetic energy than a change in mass. Kinetic energy is proportional to the square of the velocity, so even a small change in speed can result in a significant change in kinetic energy. On the other hand, mass only affects kinetic energy linearly.
Is power scalar or vector quantity?
Power is a scalar quantity because it only involves the magnitude of the force and the velocity of an object, without considering direction. It is measured in watts (W).
What is the speed in kilometers per hour of a train that travels 3701 km in 87 hours?
This is an average speed of 42.54 km/h
Is a fresh dry cell kinetic or potential energy?
A fresh dry cell contains potential energy stored in the chemical bonds of the reactants. When the cell is connected in a circuit, this potential energy is transformed into kinetic energy as the electrons move through the circuit, producing an electric current.
As the mass increases what happens to the potential energy?
It lowers proportionally to the decrease in the mass.
Since potential energy = mgh, changing the "m" would completely change the potential energy.
For instance if we look at g as 10 m/s^2 and h as 10m:
The original mass is 10kg. (10kg)*(10m/s^2)*(10m)= 1000J
If we cut the mass in half. (5kg)*(10m/s^2)*(10m)= 500J
The potential energy is cut in half.
The formula for kinetic energy, Ek, could not be simpler.
Ek = (1/2)mv2, where m is mass (in kg) and v is velocity (in m s-1). If you prefer, you could write Ek = mv2/2.
or, 810j=1/2*20Kg*v2
or,v2=810j*2/20Kg
or,v=sqrt of 81
so,v=9m s-1
If two different masses have the same kinetic energy their momenta is?
... different. Kinetic energy is proportional to the square of the speed, wherease momentum is proportional to the speed.
The total amount of energy needed per day for any given age is called what?
Basal metabolic rate (BMR) is the total amount of energy required per day to maintain basic bodily functions at rest for individuals of a specific age. It represents the minimum amount of energy needed to sustain life.
Friction converts kinetic energy into what energy?
Friction converts kinetic energy into heat energy. This occurs through the resistance generated when two surfaces come into contact and move against each other, causing the conversion of kinetic energy into thermal energy.
Yes, friction can involve static friction when two surfaces are not moving relative to each other, and kinetic friction when the surfaces are in motion. Both types of friction occur due to the interaction between the surfaces at a microscopic level.
Use the formula s = ut + 1/2 ft2
where s is the distance, u the initial velocity, t the time and f the acceleration.
Then 15.2 = (0 x t) + 1/2 2.9t2 : t2 = 15.2 x 2 ÷ 2.9 = 10.48276
Therefore t = √10.48276 = 3.2377 (4 dp)
When calculating acceleration, if the answer is a negative number, it means that the object is experiencing deceleration or slowing down. It indicates that the object's velocity is decreasing over time.
What is Potential energy and kinetic energy during walking?
Potential Eneregy is that it has the ability to move, in walking it allows you to walk or move your legs. Kinetic Energy is energy of movement, in walking it helps you have the movement you need like moving your arms, you need to be able to move and have energy.
When the 0.500kg ball collides with the stationary ball, momentum is conserved.
Meaning, initial momentum = final momentum.
Momentum of an object is = mass(m) x velocity (v).
If two objects are in the system, then you have to add up both initial momentums and set them equal to the final momentums...
So...
m x v(initial, first object) + m x v(initial, second object) = final momentum.
(0.500kg)(4.0m/s) + (1.0kg)(0m/s) = final momentum.
So the final momentum equals 2.0kgm/s...
D. 2.0 kgm/s
Is heat energy potential energy or kinetic energy?
It is kinetic energy of individual moving particles. It could be considered potential though, as in: the body with higher temperature has a potential to do work, passing its thermal energy to lower temperature body.
AnswerNeither, 'heat' is simply the name we give to energy in transit from a higher temperature to a lower temperature.
True or False Kinetic energy is stored energy?
The question is too vague: work done on what? Kinetic energy of what? If you mean: "is the work done on a body equivalent to the kinetic energy of that body?" then the answer is "in some cases it is, but in general it is not".
Generally, the work done by a force on a body equals the change in total mechanical energy of that body (this is called the work-energy theorem). The total mechanical energy of a body is equal to the sum of its kinetic energy and its potential energy. Potential energy is only relevant when the body is under the influence of what is called a conservative force, such as gravity.
We can express the work-energy theorem mathematically as follows:
KE1 + PE1 + W = KE2 + PE2 (Eq. 1)
Where W is the work done on the body under consideration, KE and PE represent kinetic energy and potential energy, respectively, of that body - and the subscripts 1 and 2 refer to the states just before and just after the work was done on the body.
If we picture a body that is far removed from any massive object (i.e., there is no significant gravity or any other conservative force field acting on the body), and we say furthermore that it is initially at rest with respect to our frame of reference, then we may set KE1, PE1, and PE2 equal to zero. Eq. 1 now becomes:
W = KE2
Or:
F d = 1/2 m v2
Where d is the distance over which force F acts, and m and v are the body's mass and velocity, respectively. Thus, in this case, work done does indeed equal the body's final kinetic energy. Remember, though, that this is only true in a special case, where simplifying assumptions have been made (no gravity, body initially at rest). Eq. 1, the general form of the work-energy theorem, generally holds in classical mechanics.
The cue ball will have a final velocity after the impulse is applied. Since no external forces act on it, its momentum will be conserved. You can calculate the final velocity using the impulse-momentum theorem: impulse = change in momentum = mass x (final velocity - initial velocity).
If you change the velocity of a moving object you change its?
Motion occurs when the object is displaced from its initial point.
Let's say we have point A. The object lies there. Then in the next frame, the object is at point B. The object then has moved from point A to point B.
Two things are required of motion: Space and time. For motion to occur, an object must move from one point in space to another point in space over an interval of time.
Compare contrast kinetic energy and potential energy?
Potential energy is energy being stored. In another way, waiting to happen. While kinetic energy is energy in motion or already happening. so in short, Potential energy is energy that has the potential to be moved,
Kinetic energy is energy in motion.
Read more: What_is_the_difference_between_kinetic_energy_mechanical_energy_and_potential_energy
Is a leaping frog potential or kinetic energy?
A leaping frog is an example of kinetic energy. Before the jump, the frog contains potential energy. When it jumps, the potential energy converts to energy of motion, otherwise known as kinetic energy.
The kinetic energy of an object is proportional to the square of its what?
The kinetic energy of an object is proportional to the square of its velocity. This means that as an object's velocity increases, its kinetic energy increases exponentially.
Examples of vector quantities?
Vector quantities are quantities that have directionality as well as magnitude.
Displacement (meters North) vs Distance (meters)
Velocity (meters per second North) vs Speed (meters per second)
A car can go 140 miles per hour what is the speed in feet per second?
205.3 feet per second at 140 mph
Answer :
potential energy (PE) = m *g *h
m= mass of object (kg)
g= gravity = 10 m/s2
h= height (m)
PE = m *g *h
9800 = 200 * 10 *h
9800= 2000 h
h= 4.9 m
