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Given data
The mass of the elevator is
The accleration during the free fall is
During the free fall, there is only one force acting on the elevator and this force is the force due to gravity.
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- e 61. At the local grocery store, you push a 14.5-kg shopping cart. You stop for a moment to add a bag of dog food to your cart. With a force of 12.0 N, you now accelerate the cart from rest through a distance of 2.29 m in 3.00 s. What was the mass of the dog food?Problems: 210, 211, 216, 218, 231, 233, 238, 242, 257, 264 I. In the figure below, the x-component of the force P is 140 lb to the left. Determine P and its y- component. P 7 ww YScientists are experimenting with a kind of gun that may eventually be used to fire payloads directly into orbit. In one test, this gun accelerates a 2.7-kg projectile from rest to a speed of 8.3 x 10³ m/s. The net force accelerating the projectile is 4.9 x 105 N. How much time is required for the projectile to come up to speed? i 189.8 Units S
- An aircraft carrier uses a device called a catapult to help accelerate jets to the speed needed for take off. The flight decks on these carriers have length d = 82 m. A jet with a mass of m = 12571 kg can be accelerated from rest to a speed of v = 49 m/s by the end of the flight deck. A.) calculate the numerical value of the magnitude of force F in newtons. B.) Wht is the numerical value of the ratio of the launch force F to the jets weight?A projectile of mass 0.75 kg is shot straight up into the air with an initial speed of 20 m/s. a. How high would it go if there were no air resistance? b. If the projectile rises to a maximum height of 12 m, determine the magnitude of the average force due to air resistance.There are two forces on the 14.4 kg crate in the overhead view of the figure below, but only one is shown. For F1= 3.6 N, a= 14.4 m/s², and 0=34.3°,The second force as a magnitude is: Select one: O a. 209.41 N Ob. 120.45 N Oc. 171.30 N Od. 43852.47 N A car travels around a horizontal bend of radius 169.6 m at a constant speed. If the coefficient of the static friction between the road and car tyres is us = 3.7, What is the magnitude of car's acceleration (m/s) when stion 9 yet wered the car is negotiating the bend at the maximum allowed speed? arked out of Home PrtScn F8 F7 F6 F5 F4 F2 F3 F1 & #3 8A9 5 0 6 7 7 V 3. 2 r 3 P 1 Y!U W %24
- A stuntman drives a car of mass 1125 kg east with a speed of 20 m/s. a. If the car accelerates at a rate of –2 m/s 2 , how long will it take the car to go 50 m? b. The stuntman drives the car off an 80 m cliff while going 15 m/s. How long will it take the car to land? c. How far horizontally from the cliff will the car land?Dave with a mass of 60 kg goes tubing down a 20 m long hill that has an angle off the horizon of 25º. (Gravity applies) a. He gets a push from the bottom of the hill, so his initial velocity is 2 m/s. How far up the hill will he go before stopping? (there’s no friction) b. He goes back down the hill and then his friend Jill tries to pull him on the tube across a small patch of grass (μk=0.30). If she is pulling parallel to the ground at constant 5 m/s for 5 sec how much power does she expend? c. After climbing back uphill, Dave decided to roll down the hill instead. If he were to be a long cylinder with a radius of 0.1 m, what is his moment of inertia? d. After rolling without slipping down the hill, what is Dave’s final velocity at the bottom of the hill? What is his angular velocity at the bottom of the hill? Dave with a mass of 60 kg goes tubing down a 20 m long hill that has an angle off the horizon of 25º. (Gravity applies) He gets a push from the bottom of the hill, so his…9. A train pulls out of a station along straight with a horizontal track five identical freight cars behind it, each of which weighs 90.0 KN. The train 25.0 m/s reaches a speed of within 5.0 mins. Of starting out. Assuming the engine pulls with a this interval, with a magnitude of a force does the coupling between cars pulls forward on the last of the freight cars? Ignore air constant force during resistance and friction the freight cars. a. 733.94N c. 45, 871.56N b. 458.72N d. 2.30KN d. 459 KN
- You are in charge of improving the safety of a carnival ride. The ride involves a 165 kg cart travelling at 13.1 the wall. m S toward a brick wall. The cart is supposed to stop at the last second just before it hits You want the cart to come to a complete stop within a time of 1.85 s. What force is required to stop the cart in this amount of time? F = N Based on the parts you have been provided, you are able to exert a force of 3820 N on the cart. What is the maximum initial speed that the cart could have and still stop within 1.85? Vmaximum = m SA rifle with a barrel length of 60 cm fires a 13 g bullet with a horizontal speed of 450 m/s. The bullet strikes a block of wood and penetrates to a depth of 13 cm. A.) What resistive force (assumed to be constant) does the wood exert on the bullet? B.) How long does it take the bullet to come to rest after entering the wood?A student pushes a 12-kg block on a frictionless, horizontal surface. If the block is initially at rest, what is the speed of the block after the student pushes the block for 5 seconds with an acceleration of 2.0 m/s/s? O 2.0 m/s 6.0 m/s 10 m/s 60 m/s