a. You are a newly graduated astronaut preparing for your first trip into space. Plans call for your spacecraft to reach a velocity of 500. m/s after 2.40 minutes. If you weigh 735 N, what force will be exerted on your body? Assume the acceleration is constant.  b. A car is traveling at 25 m/s when the driver spots a large pothole in the road a distance of 30 m ahead. He immediately applies the brakes. If his acceleration is -27 m/s^2, does he manage to stop before reaching the pothole?

Q: Your forehead can withstand a force of about 6.0 kN before fracturing, while your cheekbone can only…

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Q: A person is trying to lift a box off the floor. The box has a mass of 55kg and the person can lift…

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Q: A sled is resting on at point A when a 1.80 kN force applied on it causing it to accelerate…

A: Given that Initial force at point A is FA = 1.80 kN = 1800 N Acceleration at point A is aA = 12 m/s2…

Q: a) A dockworker applies a constant horizontal force of 70.0N to a block of ice on a smooth…

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Q: (a) An elevator of mass m moving upward has twoforces acting on it: the upward force of tension in…

A: a)Write the expression or tension,

Q: Suppose you have a 122-kg wooden crate resting on a wood floor. (μk = 0.3 and μs = 0.5)   a. What…

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Q: Under certain conditions, the human body can safely withstand an acceleration of 10 g. (a) What net…

A: Newton's second law state that the force acting on a body resting on a surface  is the product of…

Q: A safe weighing 1500N is to be lowered at constant speed down the ramp 5m long from a truck 3m high;…

A: (a) Analyze the FBD of the given system. Note: Consider the rightward direction along the inclined…

Q: Riders on the Power Tower are launched skyward with an acceleration of 4.0 g, after which they…

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Q: A locomotive accelerates a 25-car train along a level track. Every car has a mass of 5.0 * 104 kg…

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Q: a. During a rocket launch, an astronaut experiences a “g-force” (actually an acceleration) of 3.0 gs…

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Q: ckey puck slides down a frictionless ramp with an acceleration of 5.00 m/s2. What angle does the…

A: We know that We have given that The hockey puck slides down a frictionless ramp with an acceleration…

Q: A ship moves through water with two forces acting on it. One is a forward thrust through the water…

A: Thrust (force) applied by propeller on ship Fa = 1875 N Resistive (drag) force on the ship Fd = 1200…

Q: The weight of an astronaut plus his space suit on the Moon is only 250 N. (a) How much does the…

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Q: (I) What is the weight of a 68-kg astronaut (a) on Earth, (b) on the Moon (g = 1.7 m/s²), (c) on…

A: Solution: Weight=Mass×gravity. Given: Mass of astronaut = 68 kg. (a) The gravity on the Earth is 9.8…

Q: Imagine you work on a garden store during the summer. If you lift a bag of fertilizer with a force…

A: Force is defined as the product of mass and acceleration of the object. F = m*a…

Q: Zola (the wonder dog) is told to sit and stay on a bathroom scale that reads 150 newtons with her on…

A: Given The Weight of the Zola is W = 150 N. The acceleration at which Zola moves in air is a = 2…

Q: A rectangular box with a mass 23.7 kg initially at rest on a warehouse floor is acted on by a net…

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Q: What force is required to slow a 1250-kg car traveling 115 km/h to 30.0 km/h within 3.50 s? (a) How…

A: Given data The mass of the car is: m = 1250 kg The initial speed of the car is: u = 115 km/h =…

Q: an astronaut on the moon places a package on a scale and finds its weight to be 25 N.  (a) What…

A: a. the acceleration due to gravity on the surface of the moon is 1.6 m/s^2.

Q: A boat moves through the water with two forces acting on it. One is 2000 N forward push by the water…

A: Formula of acceleration of boat is as follows: a=Fnetm…

Q: Three forces acting on an object are given by  F1 = (−1.65î + 7.10ĵ) N, F2 = (4.60î − 2.1ĵ) N,  and…

A: Hint(*)  acceleration = F→m = a→F→ = F1→+ F2→ +F3→(*) direction a^ =a→a→(*) m = F→a→(*) v→ =u→ +a→t…

Q: a. How much force does an 80 kg astronaut exert on his chair while sitting at rest on the launch…

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Q: A safe weighing 2000N is to be lowered at constant speed down the ramp 3m long from a truck 2m high.…

A: Given data: Weight, W=2000 N Length of the ramp, L=3 m Height of the truck, H=2 m

Q: 2. A person of mass 60 kg is able to exert a constant 1200 N of force downward when executing a jump…

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Q: A brave but inadequate rugby player is being pushed backward by an opposing player who is exerting a…

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Q: A 1370 kg jeep traveling at 19 m/s can be stopped in 24.0 s by gently applying the brakes. a) What…

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Q: a. Determine the net force required to accelerate a 540-kg ultralight car from 0 to 27 m/s (60 mph)…

A: Given:  (a) m = 540 kg, u = 0 m/s, v = 27 m/s , t = 10 s  (b) m = 2160 kg, u = 0 m/s, v = 27 m/ , t…

Q: Boxes of several sizes rest on a frozen pond, which serves as a frictionless horizontal surface. A)…

A: Given: The force applied by the fisherman is 26 N.             The acceleration is 8.5 m/s2.  To…

Q: The weight of an astronaut plus his space suit on the Moon is only 350 N. (a) How much does the…

A: The acceleration of gravity on the moon is gmoon Acceleration of gravity on the earth is gearth…

Q: A 8.2 kg object undergoes an acceleration of 1.2 m/s2. (a) What is the magnitude of the resultant…

A: The mass of the object m=8.2 kg The acceleration of the object, a=1.2 m/s2 The magnitude of force on…

Q: A 9.00-kg object starting from rest falls through a viscous medium and experiences aresistive force…

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Q: A 1,200 kg car accelerates from 5.0 m/s to 27 m/s in 10 seconds. What is its acceleration?   What…

A: From Equation v=u+at 27=5+a(10)a =2.2 m/s2

Q: A person who has a mass of 47 kg is standing in an elevator which is accelerating downward.…

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Q: Imagine a landing craft approaching the surface of Callisto, one of Jupiter's moons. If the engine…

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Q: A soccer player starts from rest and accelerates forward, reaching a velocity of 8.00 m/s in 2.50 s.…

A: Given. Velocity, v=8 m/s, and time, t= 2.5 s.

Q: A 6.7 kg object undergoes an acceleration of 1.5 m/s?. (a) What is the magnitude of the resultant…

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Q: A brave but inadequate rugby player is being pushed backward by an opposing player who is exerting a…

A: Given, Force, F= 800 N, Mass of losing player, Ml=90 kg, acceleration, al=-1.20 m/s, and mass of…

Q: A 7.9 kg object undergoes an acceleration of 2.5 m/s2. (a) What is the magnitude of the resultant…

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Q: A 8.7 kg object undergoes an acceleration of 1.3 m/s2. (a) What is the magnitude of the resultant…

A: a) The expression for the force from Newton’s first law, F=maF=8.7kg1.3m/s2F=11.31N

Static and Kinetic Friction

Kinetic friction comes into existence when there are moving surfaces means in other words we can say that the force which comes into existing between moving surfaces is known as kinetic friction.