The record speed for a tennis ball that is served is 73.14 m/s. During a serve, the ball typically starts from rest and is in contact with the tennis racquet for 32.90 ms. Assuming constant acceleration, what was the average force exerted on the tennis ball during this record serve, expressed in terms of the ball's weight W? Express your answer as a multiple of W. Faverage= Submit Request Answer Provide Feedback ? W Which way and by what angle does the accelerometer in (Figure 1) deflect under the following conditions? Part A The cart is moving toward the right with speed increasing at 3.0 m/s. Express your answer in degrees. Enter positive value if the accelerometer deflects to the left of vertical and negative if it deflects to the right. ? Figure 1 of 1 B = Submit Request Answer Part B The cart is moving toward the left with speed decreasing at 4.0 m/s. Express your answer in degrees. Enter positive value if the accelerometer deflects to the left of vertical and negative if it deflects to the right. B= Submit Request Answer Part C ? The cart is moving toward the left with a constant speed of 2.0 m/s. Express your answer in degrees. Enter positive value if the accelerometer deflects to the left of vertical and negative if it deflects to the right. ? B = Submit Request Answer 0 A 4.0 kg book sits at rest on a horizontal table. The coefficient of static friction between the book and the surface is 0.30, and the coefficient of kinetic friction is 0.20. Part A What is the normal force acting on the book? Express your answer in newtons. n = Submit Request Answer Part B Is there a friction force on the book? Yes No Submit Request Answer Part C ? N What minimum horizontal force would be required to cause the book to slide on the table? Express your answer in newtons. Fmin = ? N A 4.0 kg book sits at rest on a horizontal table. The coefficient of static friction between the book and the surface is 0.30, and the coefficient of kinetic friction is 0.20. Fmin Submit Request Answer N Part D If you give the book a strong horizontal push so that it begins sliding, what kind of force will cause it to com static friction gravitational force kinetic friction normal force Submit Request Answer Part E What is the magnitude of this force? Express your answer in newtons. fk= 1961 Submit Request Answer ? N A hockey puck leaves a player's stick with a speed of 9.9 m/s and slides 39.0 m before coming to rest. For related problem-solving tips and strategies, you may want to view a Video Tutor Solution of Delivering the goods. Part A Find the coefficient of friction between the puck and the ice. H=0.112 Submit Previous Answers Request Answer ? Incorrect; Try Again; 18 attempts remaining Provide Feedback A 24.4 kg box of textbooks rests on a loading ramp that makes an angle & with the horizontal. The coefficient of kinetic friction is 0.25 and the coefficient of static friction is 0.37. For related problem-solving tips and strategies, you may want to view a Video Tutor Solution of A steeper hill. Part B At this angle, find the acceleration once the box has begun to move. Express your answer with the appropriate units. a = 1.1 m Submit Part C Previous Answers Correct When moving, the friction force along the ramp is W cosa, the component of the gravitational force along the ramp is W sin a, so the acceleration is (W sin - W cos a)/m = g(sin - cos ) = 1.1 m/s. At this angle, how fast will the box be moving after it has slid 5.2 m along the loading ramp? Express your answer with the appropriate units. v= 3.19 m S Submit Previous Answers Request Answer ? Incorrect; Try Again; 14 attempts remaining You find that if you hang a 1.15 kg weight from a vertical spring, it stretches 2.85 cm. For related problem-solving tips and strategies, you may want to view a Video Tutor Solution of Fishy business. Part A What is the force constant of this spring in N/m? K = Submit Request Answer Part B ? N/m How much mass should you hang from the spring so it will stretch by 9.12 cm from its original, unstretched length? Express your answer in kilograms. m = Submit Request Answer Provide Feedback ? kg