1. An electric motor is 75% efficient. It is used to raise a weight of 1000N a vertical distance of 5m in 10s. a. Given its efficiency, at what rate must power be supplied to the motor. Show solutions. b. What happens to the energy used to raise the weight?

Q: Antwan raised a 12 N physics book from a table 85 cm above the floor to a shelf 2.75 m above the…

A:

Q: 32. A skier leaves a ski jump at 15.0 m/s at some angle. At what speed is he traveling at his…

A: Since you have asked multiple question, we will solve the first question for you. If you want any…

Q: An 80 kg object is dropped from rest from a height of  25 meters above the ground. Use the concept…

A:

Q: elevator cable breaks when a 925 kg elevator is 22.5 m above the top of a huge spring (k = 8.00×104…

A:

Q: 5. Fill in the missing potential and kinetic energies in the diagram. Assume that the incline is…

A:

Q: A 25 kg box sliding to the left across a horizontal surface is brought to a halt in a distance of 25…

A:

Q: To make a batch of cookies, you mix half a bag of chocolate chips into a bowl of cookie dough,…

A: Here's the information that we need to use: FF is the applied force vv is the speed ΔtΔt is the…

Q: You lift a 1 kg object from the floor to the top of a 1.5 m high table. 1. What is the force needed…

A: Given: The mass of the object is 1 kg. The dsiplacement of the object is 1.5 m from floor to top of…

Q: Biological muscle cells can be thought of as nanomotors that use the chemical energy of ATP to…

A:

Q: A force of 6.0 N is used to accelerate a mass of 1.0 kg from rest for a distance of 12m. The force…

A:

Q: An elevator cable breaks when a 925 kg elevator is 26.5 m above the top of a huge spring (k =…

A: Given data: The mass of the elevator, m=925 kg. The height of the elevator with respect to the top…

Q: A 2400-kg pile driver is used to drive a steel beam Into the ground. The pile driver falls 6.00 m…

A: mass of pile driver (m) = 2400 kg Height of pile driver before coming in contact with top of beam…

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

A: Given that             The mass of the skier is(m) = 70Kg. Since he is moving upward with constant…

Q: Two floors in a building are separated by 4.1 m. People move between the two floors on a set of…

A: Given , Difference between height of two floor of a building(Δh)= 4.1m Mass of backpack(m)= 3 kg…

Q: A ski area claims that its lifts can move 48,000 people per hour. a.)If the average lift carries…

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: A 240 kg cable that is 100 m long hangs vertically from the top of a tall building. a. How much work…

A:

Q: what is the kinetic energy in joules of a 1120-kg automobile traveling at 88 km/h?   2. how much…

A: Given, Mass, m = 1120 kg Speed, v = 88 km/h = 88×518=24.44 m/s

Q: The average power output of the human heart is 1.33 watts.(a) How much energy does the heart produce…

A: Power is Time is Note:Find:(a) Energy produces by human heart in one day.(b) Estimate the height a…

Q: Answer the following questions: a. If you push a lawn mower across a yard in 10 seconds, how does…

A: a. If you push a lawn mower across a yard in 10 seconds, how does the work done compare with pushing…

Q: A 3 kg object has a velocity i = (3î + 2j - R) m/s at point A where its potential energy is 10…

A:

Q: A 70-kg hiker hikes from an elevation of 1,209 m to an elevation 2,199 m. i. What is the hiker’s…

A: i) As the hiker moves from a lower elevation to a higher one the gravitational potential energy of…

Q: A hiker of mass 63 kg is going to climb to the top of mount tam, which has an elevation of 2,574 ft.…

A: Given,Mass of the hiker, m = 63 kgheight of the mountain, H = 2574 ftThe hiker starts from, h = 375…

Q: 2. A winch is a mechanical lifting or hauling device consisting of a rope, cable, or chain winding…

A: Write the given values with the suitable variables. m=200 kgh=4 mη=45%=0.45 Here, m is the mass, h…

Q: a. How much horsepower does a 25 W household lightbulb consume? (Express your answer using four…

A: Q. Given that Power consumed by lightbulb P = 25 W

Q: A 70 kg kid skates down a quarter pipe and exits at 12.9 m/s.  Gravity is 10.0 m/s2. Calculate the…

A: Given that, Mass = 70 kg Speed 12.9 m/s Lost energy = 1401 J

Q: Calculate the work done by the force of gravity when a 7.0 kg object is lifted to a height of 46.0 m…

A:

Q: A box is pulled 2.0 meters along a rough surface at constant velocity using 100 N of force inclined…

A:

Q: Q2. Consider a river flowing toward a lake at an average velocity of 3 m/s at a rate of 500 m/s at a…

A:

Q: A. If a roller coaster has a total of 6632 Joules of energy at the top of a hill, then at the bottom…

A: Since you have posted a question with a multiple sub parts, we will solve first three sub - parts…

Q: A power output of 18.0 h.p. is required to overcome friction and move a certain car at a constant…

A: The power required to move a body at a certain velocity is given by P = F×v, where F = the force…

Q: A set of stadium stairs consist of 90, 20 cm high steps. A 70 kg runner is training by traversing up…

A: As per bartleby guideline for more than one subparts asked only first three are to be answered…

Q: . What type of energy does he have at the top of the hill? b. What is his potential energy?  c.…

A: The basic concepts used to solve this question are   The kinetic energy of an object is the energy…

Q: he energy efficiency of electric vehicles is usually rated in terms of the​ kilowatt-hours (of​…

A: The kWh/100 miles rating is more important for evaluating EV running expenses than MPGe.  The…

Q: 1. A box with a mass of 3.0 kg is accelerated from rest by a constant force across a floor at a rate…

A:

Q: 9. Consider a 59kg volleyball player who is jumping to spike the ball. Her O position is the bottom…

A:

Q: An elevator is designed so that when it travels upward, it has constant acceleration from rest to…

A:

Q: 1. The third floor of a house is 10 m above the street level. How much work is required to lift a…

A: Since you have asked multiple questions, we will solve the first question for you. If you want any…

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.