First you calculate the energy required to lift the object: potential energy = mgh (mass x gravity x height). Note that your problem statement doesn't mention the height - you need that, too. Energy will be in Joule. Then you divide the energy by the time, to get power (in Watt).
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.
Power = (energy) / (time) =(200 newtons x 4 meters) / (4 seconds) =200 newton-meters per second = 200 watts
m to the second power means multiply m by itself, or m x m.
Power = energy/time = 50/5 = 10 watts
9060 sec. (Apex)
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 power rating of the machine, we need to know the work done in lifting the crate and the time taken. The formula for power is Power = Work / Time. If we know the work done in lifting the crate (measured in joules), we can calculate the power rating.
The work done to lift the object is 200 J (Work = Force x Distance). The power exerted to lift the object is 40 watts (Power = Work / Time).
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 work done to lift the crate is equal to the gravitational potential energy gained: Work = force x distance = weight x height. Here, Work = 50kg x 9.8m/s^2 x 10m = 4900 Joules. Power is work done per unit time, so Power = Work / time = 4900J / 5s = 980 Watts. Therefore, the power rating of the machine is 980 Watts.
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).
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.)
The work done on the object is 200 Joules, as work is calculated by multiplying force by distance. The power expended to lift the object is 40 Watts, as power is calculated by dividing work by time. The gravitational potential energy gained by the object is 200 Joules, as the work done becomes stored as potential energy in the object.
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.
measure of weight lifted regardless of time
two watts a second
Yes, if the velocity of the object is increased.