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If the ball has a speed of 3.0 m/s just before striking the floor and a speed of 2.5 m/s just after bouncing, what is the average force of the floor on the ball? Assume the ball is in contact with t
A projectile is launched horizontally. It travels 2.050m horizontally and 0.450m vertically in the Earth's gravitational field before it hits the ground. a. What is the initial velocity of the proje
A jogger accelerates from rest to 2.7 m/s in 2.7 s. A car accelerates from 36.0 to 44.0 m/s also in 2.7 s. the acceleration (magnitude only) of the jogger is 1 m/s^2.
What phase difference between two otherwise identical traveling waves, moving in the same direction along a stretched string, will result in the combined wave having an amplitude 0.72 times that of
If these two runners had run in the same race, each running the entire race at the average speed that earned him a place in the record books, el-Guerrouj would have won. By how many meters?
A ball rolling along a floor doesn't continue rolling indefinitely. Is it because it is seeking a place of rest or because some force is acting upon it? If the latter, identify the force.
The total race is fifty meters long. If the total race is run in 6.32 s, How far does he run during the acceleration phase?
A projectile is fired horizontally with an initial velocity of 9.00 m/s near the earth's surface. Assume that the projectile does not collide with anything. a. What is the horizontal displacement of
An interstellar dust grain, roughly spherical with a radius of 3e-07 m, has acquired some negative charges such that the potential on its surface relative to infinity is -16 V. Assuming that the cha
(a) What is the angular speed of the rod just before it strikes the floor? (b) What is the magnitude of angular acceleration of the rod just before it strikes the floor?
Suppose the cannon is then unbolted from the earth, and no external force hinders its recoil. What would be the velocity of a shell fired from this loose cannon?
What time is required to fully discharge the capacitor? The capacitor is fully discharged when the charge is less than 0.01 % which roughly corresponds to a time of 10t.
What is the maximum distance that the plane can travel due west and just be able to return home?
A ball of mass 0.075kg is fired horizontally into a ballistic pendulum of mass 0.350kg and sticks. The pendulum was originally at rest. The center of mass rises a vertical height of 0.145m. What is
A 0.940 kg ball is dropped from rest at a point 4.50 m above the floor. The ball rebounds straight upward to a height of 3.50 m. Taking the negative direction to be downward, what is the impulse of
A ball is tossed straight downward from an initial height of 15.00m and strikes the ground at a speed of 11.27m/s. Calculate the speed at which it was thrown.
In an elastic collision, is the total kinetic energy the same before and after the collision? In an inelastic collision, is the total kinetic energy the same before and after the collision? What kin
An 11-mm wide diffraction grating has rulings of 890 lines per mm. Light is incident normally on the grating. The longest wavelength that forms an intensity maximum in the fifth order is closest to?
A person (weight W = 578 N, L1 = 0.835 m, L2 = 0.399 m) doing push-ups. Find the normal force exerted by the floor on each hand and each foot, assuming that the person holds this position.
A ceiling fan is turned on and a net torque of 2.1 N · m is applied to the blades. The blades have a total moment of inertia of 0.24 kg · m2. What is the angular acceleration of the bl
Two cars, A and B, are traveling in the same direction, although car A is 180 m behind car B. The speed of A is 27.3 m/s, and the speed of B is 18.6 m/s. How much time does it take for A to catch B?
From the top of a cliff overlooking a lake, a person throws two stones. The two stones have identical initial speeds of v0 = 14.0 m/s and are thrown at an angle θ =28.6°, one below the hor
To what distance x can a person who weighs 432 N walk on the overhanging part of the plank before it just begins to tip?
A major-league pitcher can throw a baseball in excess of 47.0 m/s. If a ball is thrown horizontally at this speed, how much will it drop by the time it reaches the catcher who is 18.4 m away from th
The end of the ramp is 1.5 m above the ground. Let the x axis be parallel to the ground, the +y direction be vertically upward, and take as the origin the point on the ground directly below the top