A 950 kg car accelerates from rest with a constant power of 145 hp. Neglecting air resistance, what is the speed of the car after 5 seconds? a. 35.74 m/s c. 37.74 m/s b. 33.74 m/s d. 39.74 m/s

Q: QUESTION: A 75 kg carpenter ascends a 7.0 m vertical ladder to a house's flat roof. He then travels…

A: Since we only answer up to 3 subparts so we will answer first 3. Please resubmit the question by…

Q: 4. A 128.0-N box is pulled up a frictionless ramp inclined at 30° from the horizontal at a distance…

A:

Q: A 250 g cart rolls 1.80 meters down along an inclined track. The track makes an angle of 24o with…

A: a. Let the height be h and base be represented by s. h=1.8sin24o =0.732 m s= 1.8cos24o = 1.644 m…

Q: A 70.0-kg athlete leaps straight up into the air from a trampoline with an initial speed of 8.9 m/s.…

A: The 70 kg athlete jumps off the trampoline with an initial velocity of 8.9 m/s. The force acting on…

Q: 7. A young girl (m = 30 kg) rides a skateboard (m = 3.2 kg) at a speed of 4.2 m/s. (a) How much work…

A:

Q: A 1200 kg frictionless roller coaster starts from rest at a height of 18 m. What is its kinetic…

A: Using law of conservation of energy, the expression for find kinetic energy is…

Q: An 8.0-g bullet has a speed of 800 m/s. (a) What is its kinetic energy? (b) What is its kinetic…

A:

Q: A chain attached to an object with a mass of 68.0 kg is propelled by a motor to move it up an…

A:

Q: A 46.1-g golf ball is driven from the tee with an initial speed of 42.1 m/s and rises to a height of…

A:

Q: •P49 You throw a ball straight up, and it reaches a height of 20 m above your hand before falling…

A:

Q: 1. What is the kinetic energy in joules of a 1000-kg automobile traveling at 90 km/h? a. What is the…

A: Given: The mass of automobile is m=1000 kg. The velocity of automobile is v=90 km/h.   The…

Q: 4)A 55 kg hiker starts at an elevation of 1600 m and climbs to the top of a 3300 m peak. What is the…

A: To find the change in potential energy

Q: A motorcycle can go from 0-60 mph in 3.5 sec.  The mass of the motorcycle is 450 kg.  (a)  What is…

A: The work done is equal to the change in kinetic energy. The power is defined a the rate of doing…

Q: An object moves in the positive x-direction under the influence of a force Fx . A graph of Fx vs. vx…

A: A) 8.88kW  B) 9kW

Q: A model train powered by an electric motor accelerates from rest to 0.640 m/s in 22.0 ms. The total…

A: Given Information,Initial Velocity u=0Final Velocity v =0.64 m/stime(t) = 22 ms  = 22×10-3…

Q: 3. A biker weigh 60.0kg, biking at Kalatao diversion road started sliding down from the top of a…

A: Given: m =60.0 kgh = 20.0 md = 15m

Q: 4. A 128.0-N box is pulled up a frictionless ramp inclined at 30° from the horizontal at a distance…

A:

Q: . A 0.10-kg steel ball drops to the floor from a height of 2.0 m and then rebounds to a height of…

A:

Q: The wrecking ball weighing 1,250 kg is lifted to a height of 12.7 m above its resting point. When…

A: SOlution:

Q: 1. A 10.0-kg crate slides along a horizontal frictionless surface at a constant speed of 4.0 m/s.…

A: Energy of system is always conserved. It just changes its form. Here the total mechanical energy is…

Q: A 0.800-kg particle has a speed of 1.60 m/s at point and kinetic energy of 7.70 J at point B . (a)…

A: Given,

Q: 5) A roller coaster at the top of the first hill has 1000J of potential energy and 50J of kinetic…

A: SOlution: as given that at top of hill PE = 1000 J KE = 50 J

Q: A projectile weighing 25 N is fired directly upward and rises to a height of 400 m. (a) What is its…

A: Weight of the projectile is Fw = 25 N  Height H = 400 m

Q: A toy robot powered by an electric motor accelerates from rest to 0.800 m/s in 22.0 ms. The total…

A: Write a given value of this question. v=0.800m/s t=22ms=22×10-3sm=740g=0.740kg

Q: A 0.200-kg particle has a speed of 1.50 m/s at point and kinetic energy of 7.10 J at point Ⓡ. (a)…

A: Given  Mass , m = 0.200 kg  Speed at point A , VA = 1.50 m/s  Kinetic energy at point B , KB = 7.10…

Q: 1. Your best friend's car runs out of gas so they call you for help. Luckily for you there is a gas…

A: Given data:  Displacement (d) = 50.0 m Force (F) = 600.0 N Time (t) = 2 minutes  Required: Work (W)…

Q: A 1000kg elevator, initially at rest, suffers a catastrophic mechanical failure and free falls 20m…

A:

Q: P3 A 4.80-kg watermelon is dropped from rest from the roof of a 25.0-m-tall building and feels no…

A: Given that, Mass of a watermelon, m = 4.8 kg It was dropped from a 25 m tall building, h = 25 m (a)…

Q: A 47.8-g golf ball is driven from the tee with an initial speed of 41.4 m/s and rises to a height of…

A:

Q: A helicopter lifts a 65 kg astronaut 18 m vertically from the ocean by means of a cable. The…

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Q: 4. A 200 kg boulder slides down a hill. At the bottom of the hill its velocity is 2.2 m/s. a. What…

A: Mass of boulder slide =200kg Velocity at bottom = 2.2m/s

Q: (Figure 1) is the energy bar chart for a firefighter sliding down a fire pole from the second floor…

A:

Q: 5. A 2-kg object moved from rest to a speed of 10 m/s. a) Calculate the work done on the object? b)…

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Q: A 0.32-kg particle has a speed of 5.0 m/s at point A and kinetic energy of 8.1 J at point B. (a)…

A:

Q: A 0.32-kg particle has a speed of 5.0 m/s at point A and kinetic energy of 8.4 J at point B. (a)…

A: Given: The mass of the particle is m=0.32 kg, The velocity of the particle at point A is vA=5.0…

Q: A 9.50-g bullet has a speed of 1.30 km>s.(a) What is its kinetic energy in joules? (b) What is…

A:

Q: 2. A car of mass 1200 kg initially moving at a speed of 8m/s suddenly changes its speed to 15m/s in…

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Q: A the start of a race generates 400 W of power as he accelerates to 5 m/s If the runner has a mass…

A: The rate of doing work is called power. Work is given by the change in kinetic energy.  Kinetic…

Q: The speed of a hockey puck decreases from 49 m/s to 43.88 m/s in coasting 15.4 m across the ice.…

A: Given:  Initial speed of hockey puck = 49 m/s Final speed of hockey puck = 43.88 m/s Distance…

Q: 11. (1) A small 35g toy rocket is launched straight up from the ground at 108 km/h (a) What is the…

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Q: How much energy is gained by a box of mass 20 kg when a man (a) carrying the box waits for 5 minutes…

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Q: A 61.0-kg athlete leaps straight up into the air from a trampoline with an initial speed of 9.7 m/s.…

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Instantaneous Power

Power is defined in physics as the amount of energy transmitted or transformed per unit time. The watt is the unit of electricity in the International System of Units, equivalent to one joule per second.