560 W.
Q. How much force is required to lift a rock a vertical distance of 8 m if 80 J work?
The force (N) required to lift a rock having a vertical distance of 8m and 80 J of W is 10 N.
Table of Contents
- Q. How much force is required to lift a rock a vertical distance of 8 m if 80 J work?
- Q. What is the average power output of a weightlifter who can lift 260?
- Q. How much power does it take for a 60 kg person to run up stairs at a rate of 2.5 steps per second if the stairs are each 16 cm high?
- Q. How are work and power related?
- Q. What is the power output for a 60.0 kg woman who runs up a 3.00 m high flight of stairs in 3.50 s?
- Q. How do capacitors improve power factor?
- Q. What is a bad power factor?
Q. What is the average power output of a weightlifter who can lift 260?
Physics. What is the average power output of a weightlifter who can lift 260 kg to a height of 1.9 m in 1.8 seconds? F = mg = 260kg * 9.8 = 2548N. P=W/t = FD/t = 2548 * 1.9 / 1.8 = 2690.
Q. How much power does it take for a 60 kg person to run up stairs at a rate of 2.5 steps per second if the stairs are each 16 cm high?
Total work done = p.e at top – p,e at bottom = 60* 9.8 *3. Time taken = 4 seconds. So Power developed = work done/ time taken = 60* 9.8 *3 / 4 = 15 * 9.8 * 3 = 441 Watts. P.S. You can simplify the above calculations by taking g = 10m/s^2.
Q. How are work and power related?
Work is the energy needed to apply a force to move an object a particular distance, where force is parallel to the displacement. Power is the rate at which that work is done.
Q. What is the power output for a 60.0 kg woman who runs up a 3.00 m high flight of stairs in 3.50 s?
7.77 P=0.5(60.0 kg)(2.00 m/s)2+(60.0 kg)(9.80 m/s2)(3.00 m)3.50 s=120 J+1764 J3.50 s=538 W. The woman does 1764 J of work to move up the stairs compared with only 120 J to increase her kinetic energy; thus, most of her power output is required for climbing rather than accelerating.
Q. How do capacitors improve power factor?
You can improve power factor by adding power factor correction capacitors to your plant distribution system. Power capacitors act as reactive current generators . (See Figure 6 .) By providing the reactive current, they reduce the total amount of current your system must draw from the utility .
Q. What is a bad power factor?
7. What is a good score and what is a bad score? A power factor close to unity (1) is a good power factor with little wasted energy whereas a power factor close to 0 represents a system where most of the energy is wasted. Generally, a power factor of 0.8 or above is considered a good power factor.
