A 7780-kg car is travelling at 25.8 m/s when the driver decides to exit the freeway by going up a ramp. After coasting 362 m along the exit ramp, the car's speed is 13.5 m/s, and it is h = 11.3 m above the freeway. What is the magnitude of the average drag force Fdrag exerted on the car?
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- A 91 kg janitor wearing running shoes is running across an ice rink at a speed of 3.2 m/s. They try to stop abruptly, but keep sliding across the surface of the ice. The ice exerts a frictional force of 13.4 N to slow them down. How far do they travel before halting to a stop?A sled is traveling 4.00m/s along a horizontal stretch of snow. The coefficient of kinetic friction is k = 0.0500. How far does the sled go before stopping?Biologists have estimated the drag coefficient of a swimming penguin by observing the rate at which a penguin’s speed decreases in its glide phase, when it’s not actively swimming and is slowing down. In one study, a gliding 4.8 kg Gentoo penguin has an acceleration of -0.52 m/s2 when its speed is 1.60 m/s. If its frontal area is 0.020 m2, what is the penguin’s drag coefficient?
- A 1.2 kg crate slides down a 300 ramp with a height of 2.77. The crate has a speed of 2.90 m/s at the bottom of the ramp. The ramp is 5.8 m long. What is coefficient of kinetic friction?A 116-Newton horizontal force is exerted upon a 6.8-kg box to move it across a level surface at a constant velocity of 2.8 m/s. The force of friction encountered by the box is N.While loading furniture into a truck, you push a 1.56 kg chair up a 14.7 degree ramp, with a horizontal force of 12.1 N. How long does it take to reach a speed of 4 m/s, starting from rest? The coefficient of kinetic friction chair - ramp is 0.345.
- Your Physics 4A physics textbook is pressed against the wall by a mysterious floating hand as shown in the figure below. The textbook slides down the wall at a constant acceleration such that its speed decreases by 1.25 m/s every second. The coefficient of kinetic friction between the book and the wall is uk= 0.35. Calculate the force that the hand exerts on the book.In the back of the truck is a 200kg box that has a coefficient of static friction of 0.8 and a coefficient of kinetic friction of 0.4 between the truck and the box. You are driving on the freeway at 25m/s. There is a car ahead of you that is driving at 30m/s. Your front bumper is 30m behind the back of the first car. You would like to pass the other car and pull back into the same lane when your back bumper is 10m ahead of the front bumper of the first car in 5 seconds. The length of the car ahead of you is 3m and the length of your car is 4m.a) What minimum acceleration do you need to do this?b) What distance does your car travel in that time?c) Does the box in your truck start to slide off the truck?A fire-rescue officer descends a side of cliff by abseiling down it. The mass of the officer is 64kg. At a specific time the officer stops, the rope is held under tension at an angle of 35° to the vertical. What is the magnitude of the horizontal force acting on the officer from the cliff face?
- Q. 10 : The equation of a progressive wave is given by, Y = 3 sin n 0.02 20 m. Then the frequency of the wave is (a) 100 Hz (b) 25 Hz (c) 50 Hz (d) 20 HzMany birds can attain very high speeds when diving. Using radar, scientists measured the altitude of a barn swallow in a vertical dive; it dropped 208 m in 3.0 s. The mass of the swallow was estimated to be 0.018 kg, and its cross-section area as 5.6 x 10-4 m2. What was the drag coefficient for this swallow as it dove?Komi was on vacation and went to scale Mt. Banahaw. Her weight at the base of the mountain is 540 N; on top she weighs 539.5 N. Note that the gravity acceleration decreases about 0.246 cm/s² for each 1000 m ascent. Determine the height in m of a point above the base where her weight decreases by 1.219%.