Aboy throws a snowball straight up in the air with an initial speed of 4.50 ft/s from a position 4.00 ft above the ground. the snowball falls straight back down in to a 6 inches of snow. the snowball feels a deceleration of 100 m/s2 upon impact with the snow bank before coming to rest. (a) when does the snowball hit the top of the snow bank? (b) how far from the ground does the snowball come a rest?

Unpolarized light falls on two polarizer sheets whose transmission axes are at right angles. a third polarizer is placed between the first two so that its axis makes a 52-degree angle with the axis of the first polarizer. a) what fraction of the incident light intensity is transmitted through the first polaroid? b) what fraction of the incident light intensity is transmitted through the second polaroid? c) what is the angle of polarization of the light that enters the third polaroid? d) what fraction of the incident light intensity is transmitted through the third polaroid. e) what happens if the middle polaroid is removed?

What is the efficiency of an engine that does 80 j of work and exhausts 320 j of heat while taking in 400 j of heat ? a. 10% b. 20% c. 80% d. 25%

What is the frequency if a wave that pases a given pount 22 times in 2 seconds