c) A 10.0 kg block is stacked on top of a 25.0 kg block in the diagram below. Determine the normal force exerted by the table on the combined blocks. S UTM UTM" 10 kg M 증 UTM 25 kg 5 UTM Table 5 UTM
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- A small car has a head-on collision with a large truck. Which of the following statements concerning the magnitude of the average force due to the collision is correct? O The small car experiences the greater average force magnitude. The small car and the truck experience the same average force magnitude. O The truck experiences the greater average force magnitude. It is impossible to tell since the masses are not given. It is impossible to tell since the velocities are not given. L _QUESTION 23 A ping-pong ball is dropped vertically onto a stationary bowling ball resting on the floor. Which of the balls experiences the greater force as a result of the collision? O The bowling ball Neither, both experience forces of the same size The ping-pong ball O It's impossible to tell from this dataWhen landing from a vertical leap, a 549 N dancer decreases her vertical velocity from -5.9 m/s to -1.23 m/s, while lowering her center of mass a distance of 0.18 m over 0.04 s. Calculate the average force applied by the dancer.
- One study suggests that a brain concussion can occur if a person's head is subjected to an acceleration as small as 60g, where g is the acceleration of gravity. For the steps and strategies involved in solving a similar problem, you may view the following Example 9-5 video: Part A If the mass of the person's head is 4.7 kg, what is the magnitude of the force? Express your answer using appropriate units. Templates Symbols undo redo reset keyboard shortcuts help, Value Units Submit Part B Request Answer If the impulse delivered to the person's head is 17 kg. m/s, over what time interval is the force applied? Express your answer using appropriate units. Templates Symbols undo redo reset keyboard shortcuts help Value Units REASONING AND STRATEGY Two ways to think about net impulse L-FM - What we know already Applying a force for some time causes a change in momentum Ap -2.7 kg-m/s; 7,-26.2 kg-m/s A4,-0.30 M, -0.50s m-71 kg4. A fisherman in a boat catches a shark with a harpoon. The shark struggles for a while and then becomes limp when at a distance of 300 m from the boat. The fisherman pulls the shark all the way to the boat by the rope attached to the harpoon. During this operation, the boat (initially at rest) moves 45 m in the direction of the shark. The mass of the boat is 5400 kg. What is the mass of the shark? Pretend that the water exerts no friction. (Hint: Friction is ignored, so there are no external forces, and the center of mass of the system (the shark and boat) should not move at all.) A) 953 kg B) 477 kg C) 318 kg from the left and ofTom and his little sister are enjoying an afternoon at the ice rink. They playfully place their hands together and push against each other. Tom's mass is 71 kg and his little sister's mass is 15 kg. Which of the following statements is correct? The force experienced by Tom is less than the force experienced by his sister. The force experienced by the sister is less than the force experienced by Tom. They both experience the same force. Which of the following statements is correct? Tom's acceleration is less than the sister's acceleration. Tom's acceleration is more than the sister's acceleration. They both have the same acceleration. If the sister's acceleration is 2.7 m/s2 in magnitude, what is the magnitude (in m/s2) of Tom's acceleration? (Enter a number.)
- 61 SSM A block of mass m, = 4.0 kg is put on top of a block of mass m, = 5.0 kg. To cause the top block to slip on the bottom one while the bottom one is held fixed, a horizon- tal force of at least 12 N must be ap- plied to the top block. The assembly Fig. 6-47 Problem 61. of blocks is now placed on a hori- zontal, frictionless table (Fig. 6-47). Find the magnitudes of (a) the maximum horizontal force F that can be applied to the lower block 2. so that the blocks will move together and (b) the resulting acceler- ation of the blocks. 1.A meter stick has a mass of 0.30 kg and balances at its center. When a small chain is suspended from one end, the balance point moves 12.0 cm toward the end with the chain. Determine the mass of the chain. 0 x Determine a convenient place for the origin of the coordinate system. See if you can write an expression for the center of mass of the two objects in terms of known quantities and the mass of the chain and then solve for the mass of the chain. g Submit AnswerView Policies Current Attempt in Progress The velocity of a 6 kg particle is given by = (6t î+ 2t² ĵ) m/s, with time t in seconds. At the instant the net force on the particle has a magnitude of 38 N, what are the direction (relative to the positive direction of the x axis) of (a) the net force and (b) the particle's direction of travel? (a) Number Units (b) Number Units
- 4. The parking brake fails on a parked car at the top of a hill and it rolls down the hill ¹. At that same moment an SUV is coming down a cross street at the bottom of the hill, moving at 30 miles per hour. (See diagram below.) The mass of the car is 1000 kg. The mass of the SUV is 3000 kg. a) Find the speed of the car when it reaches the bottom of the hill. b) The car and SUV collide and move off together. Find their velocity immediately after the collision. ¹ Note that the wheels of a car are so much lighter than the car itself that their rotation is negligible. In short, a rolling car acts like a sliding object, not like a rolling object. W. View from Above N E Hill Side View of the Hill 10m 40°Two cars collide head on. At every moment during collision, the magnitude of the force the first car exerts on the second is exactly equal in magnitude but in the opposite direction. This is an example of: CHoices: Two cars collide head on. At every moment during collision, the magnitude of the force the first car exerts on the second is exactly equal in magnitude but in the opposite direction. This is an example of:Current Attempt in Progress A 54.0-kg person, standing on a diving board, dives straight down into the water. Just before striking the water, her speed is 4.75 m/s. At a time of 1.77 s after entering the water, her speed is reduced to 1.34 m/s. What is the magnitude of the average net force that acts on her when she is in the water? Vo Number i Units