As the driver steps on the gas pedal, a car of mass 1 160 kg accelerates from rest.During the first few seconds of motion, the car’s acceleration increases with timeaccording to the expressiona = 1.16t − 0.210t2 + 0.240t3where t is in seconds and a is in m/s2. (a) What is the change in kinetic energy of thecar during the interval from t = 0 to t = 2.50 s? (b) What is the minimum average poweroutput of the engine over this time interval? (c) Why is the value in part (b) describedas the minimum value?

Q: A bullet of mass (20 g) is found to pass two points (30 m) apart in a time interval of (4 sec).…

A: Given Mass of bullet (m)=20 g=0.02 kgDistance between two point (D)=30 mTime taken (t)= 4s

Q: A 65-kg skier with an initial speed of 11.2 m/s coasts up a height h=2.6-m high rise as shown in the…

A:

Q: At time ti, the kinetic energy of a particle is41.1 J and its potential energy is 11.9 J. Atsome…

A: The work-energy theorem gives,

Q: A 261 kg ball from a demolition machine is propelled sideways until it is 4.83 m above its lowest…

A: Given : Mass of a ball (m) = 261 kg Height (h) = 4.83 m

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Q: A force F = 3i + 7j + 7k acts on a 2 kg mobile object that moves from an initial position of D1 = 3i…

A: We know average power P=Wt, where W=work and t=time And Work W=F.→d→ where, d→=df-di Given data:…

Q: A 191 g block is dropped onto a relaxed vertical spring that has a spring constant of k = 3.5 N/cm.…

A: here, mass of the block(m) = 191 g =0.191 Kg spring constant( k)= 3.5 N/cm = 3.5 * 102 N/m…

Q: Let's use a simple example. Say a steel ball with a mass of 0.580 kg is initially at rest. It is…

A: Provided that    Mass of ball(m) =0.580kg    Initial velocity(v)=0m/s    Height (h)=1.50m 1)…

Q: A high-performance sports car can provide 3.570 x 105 W of power. The mass of the car is 1200. kg.…

A: Given data: The power produced by the car is P=3.570×105 W The mass of the car is m=1200 kg The…

Q: A 14 kg penguin slides on its belly down an icy, frictionless glacier. If the penguin started from…

A: Write the given values of the problem- Mass=14 kg final speed(vf) vf=14 m/s

Q: F231G A single frictionless roller-coaster car of mass m 200 kg tops the first hill with speed vo =…

A:

Q: A particular spring has a rest length of 5.0 cm when it is not compressed, and a length of 4.5 cm…

A: Given data: The free length of spring is l=5 cm. Length with m=10 kg l'=4.5 cm. Acceleration of…

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Q: A world-class sprinter running a 100 m dash was clocked at 5.4 m/s 1.0 s after starting running and…

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Q: At some point, a massive cruise ship with a mass of 6.80 107 kg is traveling at a speed of 11.6 m/s.…

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Q: Each second 1080 m of water passes over a waterfall 103 m high. Three-fourths of the kinetic energy…

A: volume of water passing each second = 1080 m3Height (h) = 103 m

Q: A particle with a mass of 6 kg; It changes position over time according to the equation x = 2t ^ 3 +…

A: Given Data: The position is, x=2t3+5t2+10t. The mass is, m = 6 kg. The time considered is, t = 3 s.…

Q: A single force F(x) = −8.0x (in newtons) acts on a 3.0-kg body. When x = 6.75 m, the speed of the…

A: Given, Force, Fx = -8xMassm = 3 kg , when x = 6.75 m  , v = 4 m/swhen x=2.5m , v = ?

Q: A constant net force of 60.0 N acts on an object initially at rest and acts through a parallel…

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Q: How fast is the branch moving before it hits the ground?

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Q: When a click beetle is upside down on its back, it jumps upward by suddenly arching its back,…

A: Mass of beetle,

Q: A 5.0 kg mass is initially sitting on the floor when it is lifted onto a table 1.15 meters high at a…

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Q: (a) Find the kinetic energy of a bullet of mass 5.00 g traveling at a speed of 310 m/s. (b) Find the…

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Q: A 15.0-g bullet is accelerated from rest to a speed of 780 m/s in a rifle barrel of length 72.0 cm.…

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Q: 40-kg girl is bouncing on a trampoline. During a certain interval after leaving the surface of the…

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Q: A 54 kg student carrying an 11 kg backpack climbs up 76 steps (each step is 18 cm high) to the 4th…

A: Answer:-  Mass of a student (m1) = 54 kg  Mass of the backpack (m2) = 11 kg  Total mass (M) = (54…

Q: An athlete with a mass of 63.5 kg is in a cross country race, and at one instant he has a speed of…

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Q: A car has 20 J of kinetic energy. If its velocity is reduced by 1/2, the kinetic energy is…

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Q: If the skier coasts up the hill, what is his speed (in m/s) when he reaches the top plateau? Assume…

A: Energy can neither be created nor destroyed. It is simply converted from one form to another and the…

Q: u have a toy that uses a spring to shoot darts. A dart has a mass of 5 g, and the spring has a…

A: Givenm=5 g=5×10-3 kgk=666 N/mx=5 cm=5×10-2 mf=14 N

Q: a 60 kg object is moving at 20m/s when a force brings the object to rest in 0.050 seconds. of the…

A: Given, mass of the object (m) = 60 kg  Initial speed (u) = 20 m/s  Final speed (v) = 0 m/s  Time…

Q: Fleas have remarkable jumping ability. A 0.50 mg flea, jumping straight up, would reach a height of…

A: Due to the air resistance, some of the kinetic energy will be spent to do work against the…

Q: Estimate the kinetic energy (in GJ) of a 97,500 metric ton aircraft carrier moving at a speed of at…

A: According to question we need to find kinetic energy.

Q: The total mechanical energy of an object is the sum of its potential energy (U) and it’s kinetic…

A: Step 1: Data provided in the problem Mass: 0.0150kg Initial Height: 1m Measured Distance: 0.020 m;…

Q: A container is thrown vertically downwards, at the moment it is thrown it has a kinetic energy of…

A: According to conservation of total mechanical energy, the sum of kinetic energy and potential energy…

Q: The top of a ski hill sits at an altitude of 2000 m. If you were to "Frenchfry" (go straight down…

A: Here, we have to Use Conservation of energy As difference in altitude is given, we just have to…

Q: Peter saw Lara Jean running on the school's track field. He accelerates from rest to 6.6 m/s within…

A:

Q: The position of a 3 kg object is given by = 3t²i – 2tj . What is the work done in that at time…

A: Solution: Gieven that m = 3 kg r = 3t2i-2tj t = 1s to 2s

Q: A 1.50 ✕ 103-kg car starts from rest and accelerates uniformly to 17.9 m/s in 12.8 s. Assume that…

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Q: An object with mass of 10 kg is dropped from a height of 20 m from the ground. Assuming only the…

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Q: A pendulum bob is released from some initial height such that the speed of the bob at the bottom of…

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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.