Solar power potential is around 5 kW/m2. What wind speed gives the same power potential?

Q: How many kilometres per litter will a car obtain if its engine is 25 percent efficient and it…

A: The number of kilometers is,

Q: A typical wind turbine extracts 40% of the kinetic energy of the wind that blows through the area…

A: Given Data:The mass of the wind passing the blades each second is Speed Kinetic energy is given by…

Q: An electric motor is used to hoist building supplies from the ground to the roof of a buidling.

A: Given: Power output P = 1.5 kW time taken t = 12 sec   Concept: Power is define as the rate of doing…

Q: Darth Vader uses the Force (fitting name for it in this example) to lift an enemy rebel into the…

A: Any force acting on an object displaces the object by some distance. So this applied force does some…

Q: A50 kg skater is moving at 6.1 m/s when he starts up a hill. What is the gravitational potential…

A: Given  Mass of skater (m) = 50 kg Initial velocity (vi) = 6.1 m/s   When skater stopped  Final…

Q: How much work must be done by frictional forces in slowing a 1,059-kg car from 33.0 m/s to rest?…

A:

Q: What is the potential energy (compared to the floor) of a 1200N box which is 4.0 m above the floor?

A:

Q: If a 1000 kg car is exiting a highway through an above-the-ground ramp of 5.0 m radius at 12 m/s,…

A: The given values are, m=1000 kgr=5.0 mv=12 m/s

Q: What is the kinetic energy of a 1200 kg car whose velocity is 40 km/hr?

A:

Q: A horse pulls a cart with a force of 0.2 kN at an angle of 27 degrees with the horizontal and moves…

A: Given: The applied force is 0.2 kN. The angle of the force with horizontal is 27o. The speed of the…

Q: About 50,000 years ago, a meteor crashed into the earth near present-day Flagstaff, Arizona.…

A: Consider the mass of meteor is about 1.4×108 kg which hits at a speed of 12×103 m/s.

Q: A weight lifter bench‑presses a 150.0 kg barbell from his chest to a height equal the length of his…

A: Using work energy theorem,

Q: How much potential energy does a person of mass 92 kg have if they are standing at the top of a…

A: Given data: Mass of person (m) = 92 kg Height of building (h) = 56.2 m Acceleration due to gravity…

Q: 87. Electric energy units are often expressed in "kilowatt-hours." (a) Show that one kilowatt-hour…

A:

Q: A demolished car weighing 15,000 N is picked up by an electromagnet on a crane in a junkyard. It…

A: Weight of car (w) = 15000 N distance lifted (d) = 10 m time taken (t) = 4 seconds