To clean a rug, you can hang it from a clothesline and beat itwith a tennis racket. Use Newton’s laws to explain why beatingthe rug should have a cleansing effect.
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To clean a rug, you can hang it from a clothesline and beat itwith a tennis racket. Use Newton’s laws to explain why beatingthe rug should have a cleansing effect. Draw and Explain.
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- A baseball catcher is performing a stunt for a television commercial. He will catch a baseball (mass 145 g) dropped from a height of 60.0 m above his glove. His glove stops the ball in 0.0100 s. What is the force exerted by his glove on the ball?A block with a mass (m) of 74.7 kg slides along a horzontal surface. the coefficent of kinetic friction is .31. THe block has an ititial speed (v0) at 11.6m/s in the positive direction. 1) write and expression for the x component of the frictional force of the block experiences Ff in terms of the given variables and variables avaible. 2) what is the magnitude of the frictional force? 3) how for will the block travel before coming to rest.A toy rocket engine is securely fastened to a large puck that can glide with negligible friction over a horizontal surface, taken as the xy plane. The 9.00-kg puck has a velocity of 2.00 î m/s at one instant. Eight seconds later, its velocity is (6 î + 16 ĵ) m/s. a) Assuming the rocket engine exerts a constant horizontal force, find the components of the force. b) Find its magnitude.
- A cyclist is coasting at 18 m/s when she starts on a 450 m long slope that is 40 m high. The cyclist and her bicycle have a combined mass of 75 kg. A steady 15 N drag force due to air resistance acts on her as she coast all the way down to the bottom. a) Draw a useful picture depicting this situation. Clearly label all lengths and relevant vector quantities (velocity, force). b) How much enercy does the cyclist have at the top of the slope? c) How much work does the drag on the cyclist as she goes down the slope? Clearly indicate sign of work. d) What is the cyclist's speed at the bottom of the slope?A 1370 kg jeep traveling at 19 m/s can be stopped in 24.0 s by gently applying the brakes. a) What is the average force exerted on the jeep in this case? b) If the driver slams on the brakes, the jeep stops in 2.10 s. What is the average force exerted on the jeep in this case? c) How much time will it take it stop if the driver coasts and lets a 300 N friction force stop the car?Draw diagram or sketch to help you understand the situation. A 73kg runner starts walking at 3.4 m/s [E] and begins to speed up for 6.0 s, reaching a final velocity of 11.2 m/s [E]. Calculate the net force acting on the runner.
- S. A counter attendant in a diner shoves a ketchup bottle with mass 0.10 kg along a smooth, level lunch counter. The bottle leaves her hand with an initial velocity of 2.0 m/s as it slides, it slows down because of the horizontal friction force exerted on it by the countertop. The bottle slides a distance of 2.0 m before coming to rest. What are the magnitude and direction of the friction force acting on it? Show your work that leads to your answer. Explain each step in your workA “sun yacht” is a spacecraft with a large sail that is pushed by sunlight. Although such a push is tiny, it can be used to send the spacecraft outward from the Sun in a cost-free but slow propulsion. Suppose that the spacecraft has a mass of 900 kg and receives a push of 20 N,a) What is the magnitude of the resulting acceleration?b) How far will it travel in 1 day? c) How fast will it then be moving?What net external force is exerted on a 1.80*10^3 kg artillery shell fired if the shell accelerated at 2.55*10^4 m/s^2? a. What is the firce exerted on the artillery shell b. What is the force exerted on the ship?
- 10 of 31 Listen Study the scenario. A car is moving along a frictionless surface with a speed of 2 m/s to the left. You and your friend each come over and push the car at the same time. You exert a force of 6 N to the left, while your friend exerts a force of 6 N to the right. According to Newton's first law, how will this action affect the car's motion? The car will speed up because your force is in the same direction of the car's motion, making it speed up. The car will stop immediately because two balanced forces will cause an object to stop moving. The car will continue moving to the left but at a slower speed because your friend's force is going to make the car slow down. The car will continue to move 2 m/s to the left because there are balanced forces acting on it.Superman must stop a 105-km/h train in 100 m to keep it from hitting a stalled car on the tracks. The train's mass is 3.6 × 105 kg. A.) Determine the force that must be exerted on the train. Express your answer to two significant figures and include the appropriate units. Enter positive value if the direction of the force is in the direction of the initial velocity and negative value if the direction of the force is in the direction opposite to the initial velocity. FTS =_____________________ ______________________ B.) Compare the magnitudes of the force exerted on the train and the weight of the train (give as %%). Express your answer using two significant figures. FTS/mg = _______________________% C.) How much force does the train exert on Superman? Express your answer to two significant figures and include the appropriate units. Enter positive value if the direction of the force is in the direction of the initial velocity and negative value if the direction of the force is…A 958-kg car starts from rest on a horizontal roadway and accelerates eastward for 5.00 s when it reaches a speed of 35.0 m/s. What is the average force exerted on the car during this time? kN eastward