
Find the mass of a projectile when fired at 275 m/s if it is to have the same momentum as a 145 g projectile that is fired at 325 m/

A runner accelerates to a velocity of 5.40 m/s due west in 3 s. His average acceleration is 0.635 m/s2, also directed due west. What was his velocity when he began accelerating?

Giancoli6 18.P.038

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A car decelerates from a speed of 40 km/h to rest in 7 seconds. What is the magnitude of the acceleration in m/s2 to one decimal place?

A thin, cylindrical rod script i = 21.0 cm long with a mass m = 1.20 kg has a ball of diameter d = 6.00 cm and mass M = 2.00 kg attached to one end. The arrangement is originally vertical and stationary, with the ball at the top as shown in the figure below. The combination is free to pivot...

a 3.000 kg ball is pitched with a kinetic energy of 20.00 Joules. Then the momentum of the ball is:

You have a mass of 81 kg and are on a 60degree slope hanging on to a cord with a breaking strength of 138 newtons. What must be the coefficient of static friction to 2 decimal places between you and the surface for you to be saved from the fire?

A thin film of alcohol lies on a flat glass plate . When monochromatic light, whose wavelength can be changed, is incident normally, the reflected light is a minimum for 496 and a maximum for 620 . What is the minimum thickness of the film?

What are the forces that act on parts of the standard sewing machines. What other physic mechanisms are involved in a sewing machine?
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 The Earth’s rate of rotation is constantly decreasing, causing the day to increase in duration. In the year 2000 the Earth takes about 0.548 s longer to complete 365 revolutions than it did in the year 1900.
 (a) What is the average angular acceleration of the Earth?
 (b) If this average acceleration remains constant, in what year will the Earths rotation come to rest?
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 A spherical balloon is made from a material whose mass is 3.00kg. The thickness of the material is negligible compared to the 1.5m radius of the balloon. The balloon is filled with helium (He) at a temperature of 305degrees K and just floats in the air, neither rising nor falling. The density of the surrounding air is 1.19kg/m^3. Find the absolute pressure of the helium gas
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