A 24 g pickleball leaves the paddle with a speed of 18 m/s (assuming the ball started at rest). The paddle pushes the ball for a distance of 15 cm. a. What is the average force of the paddle on the ball? b. If the ball were served straight up what is the maximum height would reach? 5 mm 5 m/s B 8 m
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- A box with a mass of 5.0 kg on a frictionless horizontal surface is pulled horizontally with a force of magnitude 20.0 N. If the box is initially at rest, what is its speed at t = 3.0 s? O.3.6 m/s . 3.6 m/s O 12.0 m/s 18.0 m/s none of the choicesA sled and a rider together have a combined mass of 87 kg. They slide from rest down a frictionless hill elevated at 0=30° for a distance d 45 m to reach the bottom. Find the speed at the bottom of the hill. (g 10 m/s²) %3D A. 20 m/s B. 15 m/s C. 21.2 m/s D. 18.7 m/s 1. E. 30 m/s OB 00 O O3. 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
- 1. Sam, whose mass is 75 kg, takes off across level snow on his jet-powered skis. The skis have a thrust of 200 N and a coefficient of kinetic friction on snow of 0.10. Unfortunately, the skis run out of fuel after only 10 s. A. What is Sam’s top speed? B. How far has Sam traveled when he finally coasts to a stop?44. A 15 kg child slides, from rest, down a play- ground slide that is 4.0 m long, as shown in the figure. The slide makes a 40° angle with the horizontal. The child's speed at the bot- tom is 3.2 m/s. What was the force of friction that the slide was exerting on the child? 傳 4.0 m 40°A 120-g toy car is propelled by a compressed spring that starts it moving. The car follows the curved track in the figure. What is the final speed in m/s and it coasts up to the frictionless slope, gaining 0.085 meters in altitude.
- Power vs airspeed curve for a jet airplane is shown in the Figure. The velocity that corresponds to the minimum velocity is PA PR PA Vs V6 V7 a. V5 b. V7 C. V6 d. Cannot be determined V8 V9A box of mass 2.0 kg hangs by a cable from the ceiling of an elevator. The elevator is moving up at a steady speed of 8.0 m/s for 15 m. Use g = 10 m/s2. Match the answers with questions. m v ◆ the work done on the box by its weight (WW) the work done on the box by the tension force in the cable (WT) the net work done on the box (Wnet) the final kinetic energy of the box (Kf) A. 300 J B. O J C. -240 J D.-300 J E. -64 J F. 240 J G. 64 JAn antitank weapon fires a 3.00-kg projectile which acquires a speed of 50.0 m/s after traveling 90.0 cm down a launching tube. Assuming the projectile was accelerated uniformly, what was the average force that acted on it? a. 4.17×(10^3)N b. 3.62×(10^3)N C. 2.82×(10^3)N d. 2.00×(10^3)N
- A 2.0 kg object is moving to the right with a speed of 1.0 m/s when it experiences the force shown in the figure. What are the object’s speed and direction after the force ends? Express your answer to two significant figures and include the appropriate units. Enter positive value if the speed is directed to the right and negative value if the speed is directed to the left.Worksheets 4. Examine the diagram of an air powered car. At what point will the car stop moving?A UAB PH201 student on Spring Break decides to test what she has learned about Newton's Laws on the ski slope. The 57 kg UAB student skier is on a smooth frictionless ski slope which is at an angle of ? = 18.6 degrees with the horizontal. If the skier starts from rest, what is her speed after 2.5 seconds?