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- A 200-N block in contact with a level plane is acted upon by a horizontal force P = 100N. The fk = 0.20. What will be the velocity of the block after 3s, starting from rest? a. 7.905m/s b. 8.829m/s c. none d. 10.027m/s e. 9.651m/sarked out of 00 In the figure shown, two masses being pulled by a force F = 15 N on a horizontal smooth surface. If Flag question the tension in the string connecting the two masses T = 5.0N and m2 = 2 kg. Find the mass m in (kg) a. b. 4 m, c. 1 d. O 1. b O 2.c O 3. dQ5. What should be the value of the angle 0 in fig. so that the motion of the 90N block impends down the plane? The coefficient of friction u for all the surfaces is 1/3. 3ON 9ON
- 5. A projectile of mass 0.75 kg is shot straight up into the air with an initial speed of 20 m/s. if there were no air resistance? a. How high would it go b. If the projectile rises to a maximum height of 12 m, determine the magnitude of the average force due to air resistance.QUESTION 13 A 5.0-kg rock is dropped, initially at rest, from a 6.0- m-high second story window. What will be the kinetic eneergy of the rock when it hits the ground below? а. 98 J b. 196 J C. 294 J d. 385 J Ое. 424 JA parachutist is falling with speed of 55 m/s when his parachute opens. If the air resistance system = weight of system - air resistance. O a. 25 m/s O b. 50 m/s O c. 40 m/s O d. 30 m/s O e. None w v² N, where w is the total weight of the man and parachute, find his speed if t = 10sec. Note:Net force on 25
- Q2) A body (30 gm) slipping down on a board (50 cm) that set up one end in height (15 cm) to just begin moving the body determine the u, friction force, reaction force? R HR a W ВWv² A parachutist is falling with speed of 55 m/s when his parachute opens. If the air resistance is 25N' where W is the total weight of the man and the parachute, find his speed as a function of time t after the parachute opened. a. v = 5 [6-5e L6+5e-4 [6+5e 16-5e-4t b. v = 5 C. V=5 d. v = 5 [5+6e 5-6e-4t [5-6e 5+7e-4t3. A skier of mass m starts from rest at the top of a frictionless, snow covered hill angled at 0 above the horizontal. The ski down the hill a distance du and onto a flat parking lot. The coefficient of friction between the cement in the parking lot and the skis is μk. They move along the parking lot a distance dR before stopping. This is drawn below a. Derive an equation for the skier's speed at the bottom of the hill.. b. Derive an equation for dr, the distance the skier slides into the parking lot before stopping. c. If there was a little friction between the snow and skies, explain how your solution would change. You should not re-solve the problem, just describe how your methods would need to change. dH e dR
- A 75.0 kg skier slides down a 75.0 m high slope without friction. The velocity of the skier at the bottom of the slope is a. 40.5 m/s. O b. 38.3 m/s. C. 50.0 m/s. d. 20.6 m/s. O e. 29.7 m/s.5 An object of man 5kg is released from west 1000 m above the ground and allowed to foll unor the influence of gr- avity. Assuming that the force due to air resistance is prop- ortional to the velocity of the object with proportionality constant d Find S SON-sec 2 (a) the velocity of the object oftar t seconds (b) The distance the object has traveled after thecouts. is placed in a room which AC 2 hours, JA 25g ball slides dowm a smooth inclined plane 0.850 m high that makes an angle of 35 degrees with the horizontal. The ball slides down into an open box of 150 g mass. The ball and the box slide off the end of a table 1.0 m high. a.) How far from the base of the table will the box and ball hit the ground? b.) What is their final velocity?