Questions from Modern Physics

Q: A soccer ball with mass 0.420 kg is initially moving

A soccer ball with mass 0.420 kg is initially moving with speed 2.00 m/s. A soccer player kicks the ball, exerting a constant force of magnitude 40.0 N in the same direction as the ball’s motion. Over...

Q: A little red wagon with mass 7.00 kg moves in

A little red wagon with mass 7.00 kg moves in a straight line on a frictionless horizontal surface. It has an initial speed of 4.00 m>s and then is pushed 3.0 m in the direction of the initial velocit...

Q: A factory worker pushes a 30.0-kg crate a

A factory worker pushes a 30.0-kg crate a distance of 4.5 m along a level floor at constant velocity by pushing horizontally on it. The coefficient of kinetic friction between the crate and the floor...

Q: A block of ice with mass 2.00 kg slides 1

A block of ice with mass 2.00 kg slides 1.35 m down an inclined plane that slopes downward at an angle of 36.9° below the horizontal. If the block of ice starts from rest, what is its final speed? Ign...

Q: A wedge with mass M rests on a frictionless, horizontal tabletop

A wedge with mass M rests on a frictionless, horizontal tabletop. A block with mass m is placed on the wedge (Fig. P5.112a). There is no friction between the block and the wedge. The system is release...

Q: A wedge with mass M rests on a frictionless, horizontal tabletop

A wedge with mass M rests on a frictionless, horizontal tabletop. A block with mass m is placed on the wedge, and a horizontal force

Q: In Fig. P5.114 masses m1 and m2 are connected

In Fig. P5.114 masses m1 and m2 are connected by a light string A over a light, frictionless pulley B. The axle of pulley B is connected by a light string Cover a light, frictionless pulley D to a mas...

Q: A ball is held at rest at position A in Fig.

A ball is held at rest at position A in Fig. P5.115 by two light strings. The horizontal string is cut, and the ball starts swinging as a pendulum. Position B is the farthest to the right that the bal...

Q: You swing a ball on the end of a lightweight string in

You swing a ball on the end of a lightweight string in a horizontal circle at constant speed. Can the string ever be truly horizontal? If not, would it slope above the horizontal or below the horizont...

Q: Three identical 8.50-kg masses are hung by three

Three identical 8.50-kg masses are hung by three identical springs (Fig. E6.35). Each spring has a force constant of 7.80 kN/m and was 12.0 cm long before any masses were attached to it. (a) Draw a fr...