Projectiles, friction and circular motion

Question 1 of 10

A force of 20 N is needed to slide a box whose weight is 100 N at steady speed. What is the coefficient of friction?

Question 2 of 10

For a projectile launched on level ground, the range is greatest at an angle of

Question 3 of 10

A 0.5 kg stone is whirled in a horizontal circle of radius 2 m at 4 m/s. The centripetal force is

Question 4 of 10

A projectile launched at 40 m/s at 30° has a time of flight of (g = 10 m/s²)

Question 5 of 10

A ball rolls off a table 1.25 m high. How long does it take to reach the floor?

Question 6 of 10

A projectile is launched at 40 m/s at 30° to the horizontal (g = 10 m/s²). Its horizontal range is about

Question 7 of 10

A body on a rough plane begins to slide when the plane is tilted to 30°. The coefficient of static friction is

Question 8 of 10

Lubrication reduces

Question 9 of 10

A body moving in a circle at constant speed has an acceleration directed

Question 10 of 10

The force that keeps a body moving in a circle is directed