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Chapter 4 Solutions
College Physics
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- A 4.95 * 105 -kg rocket is accelerating straight up. It's engines produce 1.4 * 107 N of thrust, and air resistance is 4.55 * 106N.Considering the variables below:m =4.95*105 -kg f = 1.4 * 107 N fr=4.55*106 N What would be rockets acceleration, using a coordinates system where up is positive?arrow_forwardA 747 jetliner lands and begins to slow to a stop as it moves along the runway. If its mass is 3.56×105 kg, its speed is 73.0 m/s, and the net braking force is 4.30×105N, what is its speed 12.0 s later? How far has it traveled in this time?arrow_forwardThe 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/sarrow_forward
- scientists are experimenting with a king of gun that may eventually be used to fire payloads directly into orbit. in one test, this gun accelerates a 3.8 kg projectile from rest to a speed of 5.2 * 10^3 m/s. the net force accelarating the projectile is 2.5 * 10^5 N. how much time is required for the projectile to come up to speed?arrow_forwardAt launch a rocket has a mass of 3.66×104 kg, and the thrust of the engines is 5.34×105 N. If the rocket is launched straight upwards from the surface of Earth, what is the initial acceleration of the rocket? Take upwards to be the positive direction. Express your answer in m/s2 to 3 significant figures. Use g=9.81 m/s2.arrow_forwardA boat and its passengers have a combined mass of 5.10x10^2 kg. The boat is coasting into a pier at a speed of 1.00 m/s. How great a force is required to bring the boat to rest in 1.00x10^2 s?arrow_forward
- Two constant forces act on an object of mass m = 4.30 kg object moving in the xy plane as shown in the figure below. Force F, is 26.5 N at 35.0°, and force F, is 48.0 N at 150°. At time t = 0, the object is at the origin and has velocity (3.50î + 2.15j) m/s. 150° 35.0° (a) Express the two forces in unit-vector notation. F, - N (b) Find the total force exerted on the object. N (c) Find the object's acceleration. m/s2 Now, consider the instant t = 3.00 s. (d) Find the object's velocity. m/s (e) Find its position. (f) Find its kinetic energy from V½mv2. kJ (g) Find its kinetic energy from 2mv,2 + EF · AF. kJarrow_forwardA woman in a lift is trying to weigh a parcel with a spring scale. The lift accelerates downwards at 1.7 m/s, then travels at a constant speed of 3 m/s, and finally decelerates at 1.1 m/s. During the first stage of the motion, the scale reads 6.6 kg. Note: a spring scale is a device for measuring weight, where the parcel is suspended below a spring that is attached to a dial. The extension of the spring is proportional to the weight of the parcel, but the dial is calibrated to give the mass of the parcel in kilograms. The dial will only give the correct mass if the parcel is subjected to the Earth's normal gravity. What does the scale read during the other stages of the motion? Second Stage kg. Third Stage kg. Give your answers correct to 1 decimal place.arrow_forwardLet's say an astronaut is walking on the moon and wants to test out some basic kinematics. Because there's no atmosphere, there's no air resistance, so the only thing that can cause an object to move faster on the moon is the moon's gravity. Let's say you have a hammer and a feather, each weighing 10.0 kg and 1.00 kg respectively. When you drop them from a height of 1.65 meters, they should both hit the ground at the same time. The gravity on the moon is around 1/6 of what it is on Earth, so you need to figure out how long it'll take for the hammer to reach the ground.arrow_forward
- You push a file cabinet up a rough ramp tilted at 10.0° with horizontal at a constant speed of 1.50 m/s. The file cabinet has a mass of 30.0 kg and you are pushing with a 150 N force in the direction up along the ramp. It’s moved 4.20 m up along the ramp. Use g = 10.0 m/s2. Assuming the system is cabinet+earth+ramp, match the answers with questions. ΔK + ΔUg + ΔUsp + ΔEth + ΔEch = Wexternal What is the change in gravitational potential energy (ΔUg)? (Hint: what is Δy?) What is the change in thermal energy (ΔEth)? What is the change in kinetic energy (ΔK)? What is the work done by the external force (Wexternal)? A. none of the given B.…arrow_forwardConsider a 33 kg probe in outer space. The probe begins at rest, then experiences a net force of size 599 N for 8 s, then the net force becomes zero and the probe continues to travel for another 8 s. How far does the probe travel in total, in m? (Please answer to the fourth decimal place - i.e 10.4665)arrow_forwardCarol wants to move her 32 kg sofa to a different room in the house. She places “sofa sliders,” slippery disks with μk = 0.080, under the feet of the sofa. She then pushes the sofa at a steady 0.40 m/s across the floor. How much force does she apply to the sofa?arrow_forward
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