True or False? : A force supplying 1 W of power will change the speed of a 1-kg mass by 1.41 m/s in 1 second starting from rest.
True or False? : A force supplying 1 W of power will change the speed of...
QUESTION 10 Power, P, is defined as the rate at which work, W, is done, or the work divided by the time, t, over which that work occurs: P = W / t. Starting from rest, at the bottom of a flight of stairs, what is the power output for a person of mass 55 kg who runs up a flight of stairs of height 3.0 m and reaches the top of the stairs, in a time of 3.0 s,...
(a) Find the useful power output (in W) of an elevator motor that lifts a 2800 kg load a height of 35.0 m in 12.0 s, if it also increases the speed from rest to 4.00 m/s. Note that the total mass of the counterbalanced system is 10,000 kg-so that only 2800 kg is raised in height, but the full 10,000 kg is accelerated. (b) What does it cost (in cents), if electricity is $0.0900 per kw-h? cents Additional Materials...
Name 1) Date More Energy and Power Problems The system starts at rest. What is the speed of the system in the instant before the 10 kg mass hits the floor? LLLLLLLL m = 10kg h=2m m2 = 5kg 2) A 1400 kg sports car accelerates from rest to 95 km/h in 7.4 s. What is the average power delivered by the engine? 3) How fast must a cyclist climb a 6 hill to maintain a power output of 186...
True or False. While going at a constant speed, a 6 kg mass accumulates another 6 kg making it a total of 12 kg. The change in kinetic energy is zero.
(a) What is the expression for the magnitude of the force F required to accelerate an elevator of mass m upward starting from rest to a height H to a final speed of V(f)? (b) What is the value of the force if m=1800 kg, h=120 m, and v(f)=16m/s?
Problem 1: A car of mass 1000 kg moves at a constant speed of 20 m/s along a horizontal road where a frictional force is 200N. Calculate the power developed by the engine. If the car now moves up an incline at the same constant speed, calculate the new power developed by the engine. Assume that the frictional force is still 200 N and that sin(theta)=1/20 where theta is the angle of the incline to the horizontal. Problem 2: An...
3. An airboat with mass 250.0 kg has an engine that produces a net force of 800.0 N. Starting from rest, find the time it takes the airboat to reach a speed of 12.0 m/s.
1).In a uniform circular motion, instantaneous velocity is tangent to the circle a) True b) False c) Can's say 2).In a uniform circular motion, acceleration is normal to the velocity and directed toward the center a) True b) False c) Unknown 3). For a particle of mass 'm' moving with a uniform velocity 'v' in a circle of radius 'r', write the expression for centripetal force (Fc)? 4). If a particle rotates in a circle of radius r= 10 cm...
1. A constant external force at a downward angle of 30 degrees from hortzontal is applied to a o-kg box, which is on a rough horizontal surface. While the force pushes the box a distance of 8.00m, the speeds up from 0.500 m/s to 2.60 m/s. The work done by friction, in 3, during this process is-1040 3. What is the force, in N ? 3 2. An ideal spring is hung vertically from the celling. When a -kg mass...
The power needed to accelerate a projectile from rest to its launch speed v in a time t is 43.0 W. How much power is needed to accelerate the same projectile from rest to a launch speed of 2v in a time of vat? 43 W 86 W 172 W 344 W 0 75 W
The power needed to accelerate a projectile from rest to its launch speed v in a time t is 43.0 W. How much power is...