Which of the following represents a concave lens

The ball has a mass of 7.5 kg and the man throws it at a speed of 5.2 m/s. What is the momentum of the ball?

You observe our moon rising on the horizon at 6 pm. what will you see 6 hours later? a. a first quarter moon b. a waning gibbous moon c. a full moon on or near your meridian d. a waxing crescent moon

The Richter scale is used to determine how strong the earthquake is (magnitude) of the earthquake. It touches the ground and feels the earth shaking.

A wire loop of radius 0.37 m lies so that an external magnetic field of magnitude 0.35 T is perpendicular to the loop. The field reverses its direction, and its magnitude changes to 0.19 T in 1.3 s.

A 4.0 kg block is resting on a rough horizontal table. The coefficient of static friction us is 0.60. The static friction between the block and the table before any attempted motion is to start is N. (round to the nearest integer)

16. A block is sitting on a ramp tilted from horizontal. The block is just about to slide. T he angle of the ramp relative to horizontal is 14 degrees. What is the coefficient of friction between the block and the ramp? a. 0.25 b. 0.97 c. 0.5 d. 0.

Assume that a friend hands you a heavy book to hold as he turns the combination lock on his locker. Which of you does more work?

A tube, open at only one end, is cut into two shorter (nonequal) lengths. The piece that is open at both ends has a fundamental frequency of 422 Hz, while the piece open only at one end has a fundamental frequency of 666 Hz.

Table tennis the path of a table-tennis ball after being hit and hitting the surface of the table can be modeled by the function h=-4.9t (t-0.42) where h is the height in meters above the table and t is the time in seconds.

A coat rack weighs 65.0 lbs when it is filled with winter coats and 40.0 lbs when it is empty. The base of the coat rack has an area of 452.4 in2.