Wiki User
∙ 14y agoFirst, calculate the work done. Work is equal to the force on an object multiplied by the distance the object was moved by that force.
W = Fd
Since the bag of cement weighs 100 N, the force required to move it at a constant velocity must equal 100 N (otherwise, it would accelerate). The distance is given as 20m.
W=(100N)(20m)=2000 Nm or 2000 Joules
Next, calculate the power. Power is defined as the work done per time, or work divided by time.
P=W/t
You have already calculated the work (2000 J), and the time is given as 10 seconds.
P=2000J/10s=200 Watts
Wiki User
∙ 14y ago1 watt = 1 joule/sec; 1 joule = 1 N*m (Newton * meter) 1000 N * 4 m / 2 sec = 2000 N*M/sec = 2000 watts But this is just the power to lift the load and does not take into account any friction or the power required to create the magnetic field in the windings.
To lift a 950-N load 3 meters requires (950 x 3) = 2,850 joules of energy.The power is the rate at which the energy is delivered. It takes more powerto lift the load faster.The power used to lift this load is (2,850 joules) divided by (the number of seconds it takes),and the unit of the answer is watts.
Approx 2.62 hp
On earth, any vertical force greater than 661.39 pounds will lift a mass of 300 kg.
48.6
The power required to lift the rock onto the ledge can be calculated as work done divided by time. In this case, it is 3400J / 4s = 850 watts. Therefore, 850 watts of power is required to lift the rock onto the ledge in 4 seconds.
That really depends on the weight of the crate. Also, on how high you want to lift it. Calculate the energy required to lift the crate with the formula for gravitational potential energy: PE = mgh (mass x gravity x height) Then divide this by the 5 seconds to get the minimum power required. (The actual power is somewhat larger, for various reasons - the initial acceleration required, and losses due to friction.)
If it's to lift 30 kg, it depends how far it is to be lifted and how quickly the lift takes to complete. To lift 30 kg through 10 metres requires 30 x 9.8 x 10 joules of energy, that is 3000 Joules. To do that in 10 seconds needs 300 watts, which would be about half a horse power motor. To do it in 5 seconds the power would be 600 watts - a 1 horse power motor.
Please use the formula for gravitational potential energy (PE = mgh) to calculate the energy required. Then divide that by the time to get the power.
To calculate the time required, we first need to find the work done to lift the weight: Work = Force x Distance = 50 N x 100 m = 5000 J. Then, use the power formula P = Work / Time to find the time: Time = Work / Power = 5000 J / 1000 W = 5 seconds. Therefore, it will take the motor 5 seconds to lift the 50 N weight 100 meters at full capacity.
3000
The power of the machine can be calculated using the formula Power = Work/Time. Given that Work = Force x Distance, and the force required to lift the object will be its weight (N), the power can be calculated using the force (weight of object) and the distance it is lifted in the given time frame.
The power required to lift the object is 200 W. This is calculated by multiplying the force (100 N) by the distance (2 m) divided by the time (5 s).
The power during the lift is (weight of the barbell in Newtons)/4.4 watts.Note:Power is not "expended". Energy is. Power is the rate at which energy is expended.
The answer depends on the mass of the piano and the height of the floor.
600 watts
1 watt = 1 joule/sec; 1 joule = 1 N*m (Newton * meter) 1000 N * 4 m / 2 sec = 2000 N*M/sec = 2000 watts But this is just the power to lift the load and does not take into account any friction or the power required to create the magnetic field in the windings.