2. What is the kinetic energy of a 3.0 kg book bag just before it hits the floor after a 1.5 m fall? A. 29.4 J B. 44.1 J C. 3.38 J D. Not enough information

Q: 7. A1,200 kg car accelerates from rest to 27 m/s in 6 seconds. How much power does the engine exert…

A: Given: The mass of the car is m=1200 kg. The speed of car is v=2 m/s. The time is t= 6 s.   The…

Q: 2. A car of mass 1200 kg initially moving at a speed of 10m/s suddenly changes its speed to 15m/s.…

A: a) The required work done is,

Q: A 9.50 g bullet has a speed of 1.26 km/s. (a) What is its kinetic energy in joules?  ________ kJ…

A: The kinetic energy of the bullet is KE=12mv2=129.50×10-3 kg1.26×103 m/s2=7541.1J≈7.54kJ

Q: 13. A heavy rope, 50 ft long, weighs 0.5 lb/ft and hangs over the edge of a building 120 ft high.…

A: Length of rope = 50 ft, And weight of rope = 0.5 lb/ft Height of building = 120 ft.

Q: 11. A man uses a horizontal force of 200N to push a crate up a ramp 8m long that is 20° above the…

A: Work done by the man           =  Horizontal force ×distance travelled          =200…

Q: 6. Robin pushes a wheelbarrow by exerting a 145-N force horizontally. Robin moves it 60.0 m at a…

A:

Q: Q4. (b) A helicopter lifts a 72 kg astronaut 15 m vertically from the ocean by means of a cable. The…

A:

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: 2. A student holds her psychology book, which has a mass of 1.5 kg, out of a second-story dormitory…

A: Work(W)=Fdcosθ F is force, d is displacement, θ is angle between force and displacement when student…

Q: 8. Adult cheetahs, the fastest of the great cats, have a mass of about 70 kg and have been clocke…

A: To find: a)The amount of kinetic energy. b)The factor by which the kinetic energy will change if its…

Q: A 68.5-kg runner has a speed of 3.00 m/s at one instant during a long-distanče event. (a) What is…

A: (a) The kinetic energy of the runner is, KEi=12mv2=1268.5 kg3.00 m/s2=308.25 J=3.08×102 J

Q: 8. A person pulls a toboggan for a distance of 35.0 m along the snow with a rope directed 25.0°…

A:

Q: Jane is initially walking at a certain speed so that her kinetic energy is 150 J. Then, the rain…

A:

Q: 50. A skier of mass 70 kg is pulled up a slope by a motor- driven cable. (a) How much work is…

A:

Q: A 0.300-kg ball has a speed of 15.0 m/s. (a) What is its kinetic energy? (b) What If? If its speed…

A:

Q: 1. a) Calculate the work done when a truck pulls on a load at a 35° angle with a force of 4000 N and…

A:

Q: 3. A certain force applied on an object is depicted below. (a) What is the work done by the force…

A:

Q: 4. A 10kg object is travelling at a speed of 10m/s and then encounters a rough patch for 2m after…

A:

Q: The chin - up is one exercise that can be used tostrengthen the biceps muscle. This muscle can exert…

A: a)the work done is the product of force and distance\displacement in the direction of force.the…

Q: (I) How much work must be done to stop a 925-kg car traveling at 95 km/h?

A: Given :-      Mass of the car (m) = 925 kg       Initial velocity (v) = 95 km /h (or) 26.39 m/s

Q: 3. A skier of mass 66 kg is pulled up a slope by a motor-driven cable. (a) How much work is required…

A:

Q: Suppose the ski patrol lowers a rescue sled and victim,having a total mass of 90.0 kg, down a 60.0º…

A:

Q: 1. A net force of 60 N accelerates a 4-kg mass over a distance of 15 m. a) What is the work done by…

A: Given: F=60 Nm=4.0 kgd=15mu=0 m/s

Q: A pitcher accelerates a 0.14-kg hardball fromrest to 42.5 m>s in 0.060 s. (a) How much work does…

A:

Q: 4) A block of 1 kg falls from a vertical cliff of height 100m. a) Calculate the velocity of the…

A: Given : Mass = 1kg Height = 100 m (a) Velocity before it hits ground : We know 3rd equation of…

Q: 1. An automobile with a mass of 1200 kg travels at a speed of 90 km/h. a) What is its kinetic…

A: Given value--- mass = 1200 kg. initial speed = 90 km/s   We have to find--- kinetic energy? what…

Q: 8) A baseball of mass m arrives at a batter with speed v. The batter swings, and hits the ball. The…

A: The workdone by the bat is nothing but the change in the kinetic energy of the ball. So, all we have…

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

A:

Q: 31. a) You went to a construction site and noticed that a 50 kg bag of cement was lifted 2.0 m above…

A:

Q: 7. a) Use your energy equations to determine what height will a 0.042 kg baseball rise if it is…

A: a) Use your energy equations to determine what height will a O.042 kgbaseball rise if it is tossed…

Q: 1.A force of Si + j+ 2k N displaced a body from a position of i+j+km to 2i+4j+ 6k m. How much work…

A: as per our guidelines we are supposed to answer only one question. Kindly repost other questions as…

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)…

A:

Q: 8. The largest apple ever grown had a mass of about 2.22 kg. Suppose you hold such an apple in your…

A: (A) Kinetic energy of the apple K=12mv2=122.22 kg7.79 m/s2=67.35 J≈67.4 J

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: $3. A cyclist starts from rest and coasts down a 4.0° hill. The mass of the cyclist plus bicycle is…

A: Given: θ=4om = 85 kgd =180 m

Q: I Review After hitting a long fly ball that goes over the right fielder's head and lands in the…

A:

Q: (0) How fast (in m/s) must a 3350 kg elephant move to have the same kinetic energy as63.0 kg…

A: NOTE: According to the guidelines we can only solve one question per post(first one if not…

Q: Q4) A static object at an altitude of 30 m from the surface of the ground has a potential energy of…

A: Given,  h = 30 m  PE = 1470 J  PE = mgh  = TE (because at h = 30 m the KE is 0J)  1470 = mg x 30  mg…

Q: Baldo and Bruno reached the top of a hill 30.0 m high when they went on hiking.  If Baldo is 90 kg…

A:

Q: 0.800-kg particle has a speed of 2.10 m/s at point  and kinetic energy of 7.80 J at point . (a)…

A:

Q: 3. If you drop a 13.0kg ball from a height of 30m (neglect friction).- a. How many Joules of…

A:

Q: A 66.0-kg athlete leaps straight up into the air from a trampoline with an initial speed of 7.5 m/s.…

A:

Q: 2. A 155-g baseball is thrown so that it acquires a speed of 35 m's. (a) What is its kinetic energy?…

A: a) The expression for find kinetic energy of the ball is KE=12mv2 Substitute values in the above…

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…

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.