Identify all the forces acting on the object and draw a free-body diagram of the object. You are driving on the highway, and you come to a steep downhill section. As you roll down the hill, you take your foot off the gas pedal. You can ignore friction, but you can’t ignore air resistance.
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Identify all the forces acting on the object and draw a free-body diagram of the object.
You are driving on the highway, and you come to a steep downhill section. As you roll down the hill, you take your foot off the gas pedal. You can ignore friction, but you can’t ignore air resistance.
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- A worker pushes a box with mass 11.2 kg on a horizontal surface with a constant speed of 3.50 m/s. The coefficient of kinetic friction between the box and the surface is 0.20. a) What horizontal force must the worker apply to maintain the motion. b) If the force calculated in part (a) is removed, how far does the box slide before coming to rest?You and some friends are trying to help another friend pull his car out some mud by attaching three ropes tohis car. One friend insists that the three ropes should be attached in the fashion shown in the figure. Theforce applied by each rope is also shown in the figure. If the car has a mass of 1500 kg, what is the magnitudeand direction of the acceleration of the car?On 24 November 2021 the DART (Double Asteroid Redirection Test) spacecraft was launched. Its mission is to assess the ability of an impact to deflect the path of an asteroid. DART was launched on a Falcon 9 rocket. At launch a Falcon rocket has a mass of 555 000 kg and generates a force of 7.6 x 106 N. A. Neglecting the effect of gravity, what is the initial acceleration of the rocket? Give your answer to an appropriate number of significant figures. B. Assuming that the initial acceleration remains constant, how fast will the rocket be moving after 2 seconds? C. In practice, as the rocket burns fuel, its mass decreases. Assuming the thrust remains the same, how would your answer to part (ii) change? Would the speed after 2 seconds be lower, the same or higher?
- 5. A 40 kg girl and an 8.4 kg sled are on the frictionless ice of a frozen lake, 15 m apart but connected by a rope of negligible mass. The girl exerts a horizontal 5.2 N force on the rope.What are the acceleration magnitudes of (a) the sled and (b) the girl? (c) How far from the girl's initial position do they meet?I don't understand this practice problem.A block of mass M is suspended at rest by two strings attached to walls, as shown in the figure. The left string is horizontal with tension force T2 and and the right string with tension force T, makes an angle e with the horizontal. g is the magnitude of the gravitational acceleration. Which of the following statements is true? Select all apply. T2 M O The net force along the y-component is non-zero. O The acceleration along the x-component is zero. O The net force along the x-component is zero. O The acceleration along the y-component is non-zero. O The acceleration along the y-component is zero. O The acceleration along the x-component is non-zero. O The net force along the y-component is zero. O The net force along the x-component is non-zero.
- A block is on a frictionless table, on earth. The block accelerates at 2.6 m/s 2 when a 70 N horizontal force is applied to it. The block and table are set up on the moon. The acceleration due to gravity at the surface of the moon is 1.62 m/s 2. The weight of the block on the moon is closest to: O 38 N O 33 N O 27 N O 22 N O 44 NA box has a mass of 2.50 kg is at rest on a horizontal frictionless surface. Four forces act on the box. The four forces are: F₁ = 20.0 N (North), F₂ = 30.0 N (East), F3 = 15.0 N (South), and F4 = 40.0 N (West). What is the resulting acceleration of the box? Select one: a. b. C. d. 4.47 m/² @ 26.6° (North of West) 31.3 m/2 @ 26.6° (West of North) 31.3 m/2 @ 26.6° (North of West) 4.47 m/2 @ 26.6° (West of North)In Example 5.7, we pushed on two blocks on a table. Suppose three blocks are in contact with one another on a frictionless, horizontal surface as shown in the figure below. A horizontal force F is applied to m₁. Take m₁ = 2.00 kg, m₂ = 3.00 kg, m3 = 5.10 kg, and F = 16.0 N. (a) Draw a separate free-body diagram for each block. Choose File No file chosen This answer has not been graded yet. magnitude direction m₁ (b) Determine the acceleration of the blocks. m/s² m₂ m₂ |---Select--- ✓ (c) Find the resultant force on each block. block 1 N block 2 N block 3 N (d) Find the magnitudes of the contact forces between the blocks. between block 1 and 2 N N between block 2 and 3 Need Help? (e) You are working on a construction project. A coworker is nailing up plasterboard on one side of a light partition, and you are on the opposite side, providing "backing" by leaning against the wall with your back pushing on it. Every hammer blow makes your back sting. The supervisor helps you put a heavy…
- Road Runner's revenge. Wile E. Coyote is on the vertical front of a train that is accelerating. He is not standing on anything and is not holding on to anything. He is being held up solely by the frictional force between him and the front of the accelerating train. Coyote has a mass of 18.0 kg, and the coefficient of static friction is 0.20 for this situation. Determine the minimum acceleration required for the coyote to not slip down the front of the train.On earth, a block sitting on a frictionless, horizontal table accelerates at 7.11 m/s² when a 40-N horizontal force is applied to it. The block and table are then moved to the moon where the acceleration due to gravity is 1.65 m/s². Find the magnitude of the block's weight wm on the moon. Wm = Nit it possible to find part b using cosine not sine?