Consider a ball of mass m that is tossed vertically into the air. Do not neglect drag. What is the free body diagram of the ball halfway between when it is thrown and when it reaches its peak height?
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Consider a ball of mass m that is tossed vertically into the air. Do not neglect drag. What is the free body diagram of the ball halfway between when it is thrown and when it reaches its peak height?
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- A 845-kg car starts from rest on a horizontal roadway and accelerates eastward for 5.00 s when it reaches a speed of 30.0 m/s. What is the average force exerted on the car during this time?A lamp hangs vertically from a cord in a descending elevator that decelerates at 1.7 m/s2. (a) If the tension in the cord is 63 N, what is the lamp's mass? (b) What is the cord's tension when the elevator ascends with an upward acceleration of 1.7 m/s2?A person catches a ball with a mass of 145 g dropped from a height of 60.0 m above his glove. His hand stops the ball in 0.0100 s. What is the force exerted by his glove on the ball? Assume the ball slows down with constant acceleration.
- Mr. X was on another planet. He released a 100-g object from rest from aheight of 10.0 m and measured that it took 2.2 s to reach the ground. Disregard others forces on the ball from the atmosphere of the planet. How much does the object weigh on the surface of that location?A block of mass 3m is placed on a frictionless horizontal surface, and a second block of mass m is placed on top of the first block. The surfaces of the blocks are rough. A constant force of magnitude F is applied to the first block as in Figure P4.68.(a) Construct free-body diagrams for each block. (b) Identify the horizontal force that causes the block of mass m to accelerate . (c) Assume that the upper block doesn not slip on the lower block , and find the acceleration of each block in terms of m and F.Be sure to review Examples 5.13, 5.14, and 5.15 (Section5.3) before attempting these problems. Figure You pull on a crate using a rope as in (Figure 1), except the rope is at an angle of 20.0° above the horizontal. The weight of the crate is 325 N, and the coefficient of kinetic friction between the crate and the floor is 0.270. What must be the tension in the rope to make the crate move at a constant velocity? Express your answer with the appropriate units. T₁ = Submit Part B 0 4 Value n1 = ША Request Answer Units Value What is the normal force that the floor exerts on the crate? Express your answer with the appropriate units. @ Units ? ?
- Same rocket as in the previous question. After the rocket has been in flight for a while, having burned and exhausted 80,000 kg of propellant, its acceleration has reached 25.0 m/s². All this while the thrust has been constant at 5.00 x 106 N. What is the magnitude of the drag force (that is, the resistance from the air) at this point? Note that at this point the rocket's altitude is still low, so you can still take gravity to be g = 9.81 m/s² O 1.18 x 106 N O 8.23 x 105 N O 5.00 x 106 N O 3.00 x 106 NA fuzzy die (m = 0.2 kg) hangs from the ceiling of a car. When the car accelerates forward along a horizontal road, the die swings backward so that the string supporting it makes an angle of 4° with the vertical. What is the acceleration of the car?A crate is moving as shown is slowed down by a pushing force P. The force P has a horizontal component of 200 newtons to the left and a vertical component 300 newtons down. The mass of the crate is 90 kgs and the coefficient of kinetic friction is 0.2 and static friction is 0.4. V P What is the magnitude of the acceleration of the crate? Answer in m/s². Use g = 10 m/s². Don't guess! Use the free body diagram method.
- A box with mass 32.5 kg rests on a frozen pond, which serves as a frictionless horizontal surface. If a fisherman applies a horizontal force of 14.0N to the box causing it to accelerate to the right. What is the acceleration produced? How far does the crate travel in 10.0 seconds?The rocket in a rocket-powered airplane generates a steady force of 10,000 N in the forward direction and the plane moves horizontally at a constant velocity of 300 m/s through the air. The rocket engine is upgraded so that it now provides a forward force of 90,000 N. What is the new constant velocity of the plane? You cannot neglect air resistance in this question. 200 m/s 300 m/s 400 m/s 600 m/s 900 m/sd , e and f