7349

Physics Force & Laws Of Motion Level: Misc Level

A 0.50-kg bomb is sliding along an icy pond (frictionless surface) with a velocity of 2.0 m/s to the west The bomb explodes into two pieces. After the explosion, a 0.20 kg piece moves south at 4.0 m/s What are the components of the velocity of the 0..30 kg piece?


7323

Physics Force & Laws Of Motion Level: Misc Level

A rope connects Boat A to Boat B.Boat A starts from rest and accelerates to a speed of 9.5 m/s in a time of 47 s. The mass of Boat B is 540 kg. Assuming a constant frictional force of 230 N on Boat B, what is the magnitude of the tension in the rope that connects the boats during the time of acceleration?


7322

Physics Force & Laws Of Motion Level: Misc Level

A 20 kg object is held vertically from a fixed plank by two vertical ropes. What is the tension in each rope?


7321

Physics Force & Laws Of Motion Level: Misc Level

A 10 kg block is moving at a constant speed of 6 m/s horizontally on a rough surface. If the force of friction is 20 N, approx how far will the block travel before it stops?


7298

Physics Force & Laws Of Motion Level: Misc Level

A favorite piece of exercise equipment consists of various springs.In one exercise, a person pulls a handle grip attached to the free end of a spring to 0.80 m from the unstrained position. The other end of the spring (spring constant is 53 N/m) is held in place by the equipment from. What is the magnitude of the force that is applied to the handle grip?


7258

Physics Force & Laws Of Motion Level: Misc Level

Magnet A has twice the magnetic field strength of magnet B, and at a certain distance, it pulls on magnet B with a force of 50 N, With how much force, then does magnet B, pull on magnet A?


7228

Physics Force & Laws Of Motion Level: Misc Level

A 3.0-g bullet traveling at 350 m/s hits a tree and slows down uniformly to a stop while penetrating a distance of 12 cm into the tree,s trunk. What was the force exerted on the bullet in bringing it rest?


6902

Physics Force & Laws Of Motion Level: Misc Level

Block A, with a mass of 10 kg, rests on a 30% incline ,The coefficient of kinetic friction is 0.20. The attached string is parallel to the incline and passes over a massless, frictionless pulley at the top. Block B, with a mass of 3.0 kg, is attached to the dangling end of the string . Find the acceleration of B (magnitude and direction);


6901

Physics Force & Laws Of Motion Level: Misc Level

Why do raindrops fall with constant speed during the later stages of their descent?

 a.The gravitational force is the same for all drops

 b. Air resistance just balances the force of gravity

c. The drops all fall from the same height

d. The force of gravity is negligible for objects as samall as raindrops

e. Gravity cannot increase the speed

of a falling object to none these ft/s


6900

Physics Force & Laws Of Motion Level: Misc Level

A 1000-kg airplane moves in straight flight at constant speed. The force of air friction is 1800 N. The net force on the plane is;

a. zero

b.11800 N

c. 1800 N

d. 9800 N

e. none of these


6898

Physics Force & Laws Of Motion Level: Misc Level

The system shown remains at rest. Find the force of friction on the upper block;


6897

Physics Force & Laws Of Motion Level: Misc Level

A  block is first placed on its long side and then on its short side on the same inclined plane. The block slides down the plane on its short side but remains at rest on its long side.A possible explanation is;

a. the short side is smoother

b. the frictional force is less because the contact area is less

c.case

d. the normal force is less in the second case

e. the force of gravity is more nearly down the plane in the second case


6896

Physics Force & Laws Of Motion Level: Misc Level

A 400-N block  is dragged along a rough (uk=0.4) horizontal surface by an applied force c as shown. The block moves at constant velocity. Find the magnitude of F;


6894

Physics Force & Laws Of Motion Level: Misc Level

A horizontal shove of at least 200-N is required to start moving a 800-N crate initially at rest on a horizontal floor. Find the coefficient of static friction is;


6893

Physics Force & Laws Of Motion Level: Misc Level

A brick slides on a horizontal surface. Which of the following will increase the friction force on it?

a. Putting a second brick on top

b. Decreasing the surface area of contact

c. Increasing the surface area of contact

d. Decreasing the mass of the brick 

e. None of the above


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