A uniform door weighs 50.0 N and is 1.0 m wide and 2.7 m high. What is the magnitude of the torque due to the door's own weight about a horizontal axis perpendicular to the door and passing through a corner?

A 3.00 kg steel ball strikes a wall with a speed of 13.0 m/s at an angle of 60.0 with the surface. It bounces off with the same speed and angle. If the ball is in contact with the wall for 0.200 s, what is the average force exerted by the wall on the ball? (Assume right is the positive...

What is the kinetic energy of an automobile with a mass of 1280 kg traveling at a speed of 11.4 m/s?

A person exerts a horizontal force of F = 179 N in the test apparatus shown in the drawing. (h = 0.33 m.) Find the horizontal force M that his flexor muscle exerts on his forearm.

A converging lens (f = 11.0 cm) is held 5.60 cm in front of a newspaper, the print size of which has a height of 1.70 mm. Find (a) the image distance (in cm) and (b) the height (in mm) of the magnified print.

Sam, whose mass is 80.0 kg, takes off down a 55.0 m high, 10.0^\circ slope on his jet-powered skis. The skis have a thrust of 220 N. Sam's speed at the bottom is 40.0 {\rm m/s}. What is the coefficient of friction of the snow?

A 20 loudspeaker is suspended 2.0 below the ceiling by two cables that are each 20 from vertical. what is tension of ropes

A massive steel cable drags a 25.0 kg block across a horizontal, frictionless surface. A 90.0 N force applied to the cable causes the block to reach a speed of 4.50 m/s in 1.50 s. What is the difference in tension between the two ends of the cable?

An undersea research chamber is spherical with an external diameter of 5.40 m. The mass of the chamber, when occupied, is 70400 kg. It is anchored to the sea bottom by a cable. Calculate the following. (a) the buoyant force on the chamber N (b) the tension in the cable N

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