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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 can scientists determine the top speed of a bullet?
There are several possibilities to determine this velocity:
1 Use a highspeed camera and analyse the footage,
know how many frames / second were shot, and measure the distance travelled between frames.
2 What goes up, must come down:
If the mass of the bullet is known, shoot into the sky,
wait for it to fall, and measure the time it takes for the bullet to drop to the ground again. With some mathmatics you can estimate the initial speed of the bullet. (however due to air resistance it isn't the most accurate method, and a dangerous one at that :) )
3 U could also shoot into a pendulum, and look at how high it swings.
If the mass of the pendulum and bullet are known, the height they reached together is a measure for the maximum potential energy they had at that point. All this energy came from the kinetic energy of the bullet. And, since the mass of the bullet is assumed to be known, from this energy it's initial speed can be calculated.
If you're creative enough I'm sure you could find some other ways. Be aware that i don't know how, for example, forensic detectives determine the speed. Or other professionals for that matter. But "scientist" could be anything really ..., so there.
Hope this answer helps
AnswerThey set up a certain distance between the exit of the barrel and the target which is going to stop the bullet (nothing too long because gravity and air would slow the bullet down). They use equipment that measures how much time it takes for the bullet to hit the target. Add in some basic math and you have the top speed of a bullet.New comment
There is however, another way to determine the average speed of bullet. by simply firing the bullet at a target with te rifle perfectly horizontal, you can find out how far the bullet's height decreases. by finding this, one can determine how long it took for the bullet to traverse the distance between the rifle and the target. and with some clever maths (v^2=u^2+2as) one can determine the maxime velocity of the bullet.
How do you find diplacement in position time graph?
Usually time is the independent variable on the horizontal (or X) axis. Position or displacement is the dependent variable (that is, it's a function of time) on the vertical (or Y) axis. For any point on the curve, there will be an associated value for time, t, and a corresponding value for displacement, s. In other words, you can determine an object's position -- or displacement from the origin -- for any time, t. Going further, you can determine an object's speed, too. For any two points on the curve, (t1, s1) and (t2, s2), the speed can be calculated using the following formula: Speed = (s2 - s1) / (t2 - t1)
How many forces make up the net force?
However many there are exerted on the object. Usually there is gravity, friction, and another force exerted on the object.
Why do balanced forces always have a net force of 0?
When forces are in equilibrium, the net force is always zero. This is because each and every force in every direction balances out.
For example, a person is hanging by a harness from a rock climbing course. He is stationary (not moving). This means his weight force of 780N is equal to the force the rope and harness has (-780N - due to opposite direction).
780N + -780N = 0N (Hence the net force is zero).
Alternatively, you can use F = ma (Newton's Second Law) to show this problem.
Fnet = ma
= 78kg x 0ms-2
= 0N (hence the net force is zero.
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What type of general energy is based on motion and depends on an objects speed and mass?
kinetic energy
The formula for determining kinetic energy is KE = 1/2mv2, where m is mass in kg, and v is speed in m/s.
Projectiles are basically just objects that move through air along a trajectory without a propulsion system.
A simpler definition is that projectiles are things that move through air along a curved path without anything to push it forward, like a motor. Examples would be like an eraser that you throw at someone.
What are the principles of physics?
Much of physics can be derived from the principle of least action. A more complete answer could fill up several books, so I will just stop here.
http://en.wikipedia.org/wiki/Principle_of_least_action
The most widely used principle: Using an axe.
One of the most important strategy for conquering and solving problems: Divide and Conquer. Divide the problem into individual units and solve the units individually. Finally, piece them up to obtain a complete picture.
One of your resources in doing this is basic differentiation-which divides the problem into parts and integration-summing or piecing up.
If you are moving at 10 knot what is the conversion to miles per hour?
10 Knots = 11.507794 MPH If 1 knot = 1.1507794 mph, then 10 X 1.1507794 = 11.507794
A dimensionless number which is a ratio of kinematics viscosity to thermal?
The ratio between the kinematic viscosity and the thermal diffusivity is called the Prandtl Number.
6 x 40 = 240 miles
Kinetic energy is proportional to velocity2, so if velocity is multiplied by four the kinetic energy is multiplied by sixteen
If you have the distance (in miles) in 9 hours, divide the distance by 9.
How is energy and the kinetic theory involved in each of these six processes?
What six processes would be a good comeback question.
Name the processes and one of us will have a stab at it.
What is the impact force of an airsoft bb traveling at 450fps?
Without the weight of the airsoft BB, it is impossible to answer this question as Force is affected by the mass of the projectile.
What is the relationship between forces and energy?
Forces can change the energy of an object by doing work on it or transferring energy to it. Energy can also be stored in an object as potential energy, which can be converted into kinetic energy when forces act on the object. In general, forces are related to changes in energy through the work-energy principle.
Ignore the kinetic friction coefficient, that is only in the problem to trick you. If the force pulling the sled is parallel to the ground, then the problem should be pretty easy. Acceleration due to gravity = 9.8 m/s^2
What is acceleration of a body moving with uniform velocity?
zero because the initial and final velocity is constant .
so,difference bet. final velocity and initial velocity is zero
horizontal component = 915 m/h so 915*2.3=2104 miles horizontally
vertical component = 915 m/h (409m/s)
u=409m/s
t=2.3 s
a= -10 (m/s)/s
s=?
s=ut+(0.5*a*t^2)
s=(409*2.3)+(0.5*-10*2.3*2.3)
s=940.7+-26.45
=914.25 miles vertically
and this time correctly
horizontal component = 915 miles/h = 409meters/s * 2.3 s = 941meters horizontally
vertical component numbers ok but result in meters , not miles ,so
= 914.25 meters vertically
In a distance-time graph the slope of is the ratio of time to distance?
no it's the ratio of distance to time (ie speed)
