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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
What is the escape velocity of planet Jupiter in miles per hour?
The escape velocity of planet Jupiter is: ~133,097.71 miles per hour.
What happens to a crash test dummy in a 15 mph crash if the dummy is not wearing a seatbelt?
In a 15 mph crash without a seatbelt, the crash test dummy would experience the full force of the impact which could result in injuries such as head trauma, whiplash, or broken bones. Without the seatbelt to restrain the dummy's movement, it may also be thrown forward or out of the vehicle, increasing the risk of serious harm or death.
At 0 Kelvin, all molecular motion stops, so the kinetic energy of the vapor molecules would be zero. Therefore, the kinetic energy of the vapor would be reduced to zero.
How fast do you need go to walk a 5k in 40 minutes?
For a top athlete it should take about an hour. A beginner prob an hour and a half
How do you find distance with final velocity and minimum acceleration?
vf2 = vi2 +ad, where vf is the final velocity, vi is the initial velocity, a is acceleration, and d is displacement. In physics, velocity is the change in position of an object over a given time interval, and change in position is displacement, rather than distance.
To find displacement, manipulate the equation in the following manner. Assume vi is zero.
vf2 = 0 + 2ad
vf2 = 2ad
vf2/2a = 2ad/2a
vf2/2a = d
To convert miles per hour to kilometers per hour, you can multiply by 1.60934. Therefore, at 150,000 mph, you would be traveling at approximately 241,402 kilometers per hour.
Does kinetic energy of photo electron depend upon intensity of light?
No, the kinetic energy of a photoelectron is primarily determined by the frequency of the incident light (photon energy), not the intensity of the light. Increasing the intensity of light will increase the number of photoelectrons emitted but will not change their individual kinetic energies.
How fast is the fastest woman in mph or km and hour?
The fastest woman in recorded history is Florence Griffith-Joyner, who reached a top speed of 10.49 meters per second during her 100m world record run in 1988. This equates to approximately 37.6 km/h or 23.4 mph.
What is the effect of acceleration on an object which is not moving?
An object which is not moving is not experiencing any acceleration, other than the acceleration due to gravity, which, along with mass gives it its weight. The upward force (normal force) acting on the object is equal to but opposite to its weight, and all of the forces acting on the objects are in equilibrium so the net force is zero Newtons.
Will equation of motion be valid for non uniform motion?
Newton's first law of motion states that momentum is a property of a mass system
that is conserved as long as no net force is applied on it.
If the question refers to Newton's second law of motion, the answer is yes.
Is second equation of motion valid for non uniform acceleration?
Yes. It just has to be remembered that the equation is describing a balance between
a force and the increment of momentum of the system per time unit on which the force is being applied "at a given instant t".
For a given system with constant mass m, we can write Newton's 2nd law of motion
as:
F(t) = m∙a(t)
where force F(t) and acceleration a(t) are a function of time (notice that if the force
is constant during time applied, acceleration results constant or uniform).
If you know how the force is varying in time (function F(t)), then you know the
function of acceleration in time: a(t) = F(t)/m
Why achanging velocity cannot maintaining constant speed?
Velocity is a vector quantity that includes both speed and direction. If the velocity is changing, it means either the speed, direction, or both are changing. Therefore, if the velocity is changing, the object cannot maintain a constant speed.
Why not all potential energy is converted to kinetic energy in roller coaster?
Not all potential energy is converted to kinetic energy in a roller coaster because some of the potential energy is lost due to friction, air resistance, and other forms of energy dissipation. This loss of energy results in not all of the potential energy being transformed into kinetic energy.
If the speed of the car becomes NV, with N > 1, the minimum distance it can be stopped over remains the same at S. This is because the stopping distance is primarily determined by factors like initial speed, braking capacity, and road conditions, rather than the multiple of the speed.
It depends on the context. In some situations, 60 kph could be considered fast, while in others it may be considered slow. It's important to consider factors such as speed limits, road conditions, and the type of vehicle being driven.
Can a position time graph tell in which directionthe displacement of an object is?
Yes. If the slope is positive, the direction of the displacement is positive (e.g. north, east, or right). If the slope is negative, the direction of the displacement is negative (e.g. south, west, or left).
Vector quantities are quantities that have both magnitude and direction. An easily understood example is velocity, which has both speed (the magnitude component) and direction. If we say 60 miles per hour or 8 knots per hour, and we add direction, like east or west, or course 220 magnetic, for example, we're talking about a vector. Electromagnetic fields also have amplitude (a measure of magnitude) like 10 volts/m and direction east or north for example. It really is that simple, and the investigator only has to remember the direction component and add it to a magnitude to lock in the idea.
Light is not a vector quantity, it has size and the speed of light 300 mega meters/second, but it does not have a direction. Another example is like saying I was driving home at 60 mph. The '60 mph' is a speed, but not a velocity (a vector) because there is no direction specified.
It is important in science to distinguish between vectors and real quantities. Real quantities do not have a direction. This can be seen as no direction or it can be seen as omnidirectional. Omnidirectional would be wrong, at best reals could be said to be origin directional. Positive real could be said to be toward the origin and negative real could be said to be away from the origin. Vectors are related to the origin and directional axis. Real numbers define the origin and a real axis, vector quantities define specifically directions and directional axis based on the real zero point.
How do you find mean kinetic energy when given only mass and horizontal distance traveled?
You don't have enough information in this case. Kinetic energy depends on mass and speed. Speed can be calculated as distance / time - and no time is given, nor is there any other information that allows you to calculate the time.
Note that even if time is given, you can calculate the average (mean) speed, but that will only give you a rough idea of the mean kinetic energy. In this problem, if the speed changes a lot, the average kinetic energy (averaged over time) will be greater than in the case of a constant speed. This is because kinetic energy is proportional to the square of the speed.
When does a cyclist appear to be stationary with respect to another moving cyclist?
A cyclist appears to be stationary with respect to another moving cyclist when they are both moving at the same speed and direction. This occurs when they maintain a consistent distance and speed relative to each other.
What line segments on a position versus time graph is physically imposable?
A physically impossible line segment on a position versus time graph would be one with a slope representing a speed greater than the speed of light or negative speed (moving backwards in time). These scenarios violate the laws of physics.
