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How long would it take a 7.5 kW motor to raise a 500 kg piano to an apartment window 1000 meters above the ground?
The motor provides energy at the rate of 7500 Joules each second.
The energy needed to raise the piano = mass of the piano x acceleration due to gravity x height = 500 x 9.81 x 1000 = 4.905 x 106 Joules
time taken = 4.905 x 106 / 7500 = 654 seconds
So, it would take around 11 minutes.
What else can I help you with?
A ball is thrown horizontally from a cliff and hits the ground 4 seconds later 40 meters from the base of the cliff?
The ball was thrown horizontally at 10 meters per sec, and the thrower's arm was 78.4 meters above the base of the cliff.
How many minutes will it take two balloons to meet if a balloon 10 meters above the ground and rising 15 meters per minute and a balloon 150 meters above the ground descending at 20 meters per minute?
The two balloons are 150-10 = 140 metres apart. They are travelling towards each other at a speed of 15+20 = 35 metres per minute. 140 m at 35 m/minute takes 140/35 = 4 minutes.
A rabbit falls in a dry well 30 meters deep when she tries to climb out she goes up 3 meters than falls back 2 meters how many days will it take her to get out?
At the end of the first day she is (3 - 2) = 1 meter above the bottom.At the end of the second day she is [ 1 + (3 - 2) ] = 2 meters above the bottom.At the end of the third day, she is [ 2 + (3 - 2) ] = 3 meters above the bottom....At the end of the 28th day she is 28 meters above the bottom, assuming she hasn't starved to death yet.During the 29th day, she is in the process of climbing up 3 meters, when she reaches the top and flops outonto the ground. This happens at some time during the 29th day.
What is the gravitational potential energy equation?
Gravitational potential energy = Mass x gravity x heightTherefore, an object at ground level is 0 meters above the ground, thus having no potential energy.PE = mghm = massg = gravitational accelerationh = height
A rabbit falls in a dry well 30 meters deep when she tries to climb out she goes up 3 meters than falls back 2 meters she stops where is for the day and start how many days will it take her to get out?
At the end of the first day she is (3 - 2) = 1 meter above the bottom.At the end of the second day she is [ 1 + (3 - 2) ] = 2 meters above the bottom.At the end of the third day, she is [ 2 + (3 - 2) ] = 3 meters above the bottom....At the end of the 28th day she is 28 meters above the bottom, assuming she hasn't starved to death yet.During the 29th day, she is in the process of climbing up 3 meters, when she reaches the top and flops outonto the ground. This happens at some time during the 29th day.===============================================Another contributor says:The Answer is 28 days not 29. The rabbitt would come out on the 28 day.
How high is the window above the ground if a ball drops and strikes the ground 2.00 seconds later?
As , s = ut + 1/2 a t2 , since a ball is dropped , the equation is modified as h = ut + 1/2 g t2 Therefore , h = 0 x t + 1/2 x 9.8 x 22 [ u = 0 ,since the ball is at rest] h = 19.6 meters Height of the window = 19.6 meters
A boy is throwing a stone at a girl's window 3m high 10 meters from the house If the stone is thrown at 15ms at an angle of 31 degrees to the ground will he hit the window?
We need 1 more piece of information, the size of the window. I will be treating the window as 1 m tall. So the window is 2.5 meters off the throwing plane (the bottom of the window) to 3.5 meters off the throwing plane (top of the window). I am also assuming that the window's height is based on how high it is above the throwing plane of your arm (if that is the height off the ground, we also need to know how tall you are). The rock will hit 2.676 meters above the throwing plane so it will hit the bottom portion of the window (as seeing as the window goes from 2.5 meters to 3.5 meters).
What do you think of this article floating hotel that floats thousands of meters above ground?
I think a hotel that is floating thousands of meters above ground is bull and run by some wacko
What is the height from floor to window sill?
It depends on how heigh the window sill is from the ground. it can be right above it, or far from the floor.
How steep to make a wheelchair ramp when door is 2 meters above ground and 15 meters from garage?
7.5 degrees
A cat with a mass of 4.50 kilograms sits on a ledge 0.800 meters above the ground If it jumps to the ground how much kinetic energy will it have just as it reaches the ground?
If a cat that has a mass of 4.50 kilograms sits on a ledge that is 0.800 meters above ground and it jumps down to the ground, it will have a specific amount of kinetic energy just as it reaches the ground. In this instance, the answer would be 35.3J.
What is the height of cirrus?
Cirrus clouds typically form at high altitudes, around 20,000 to 40,000 feet (6,000 to 12,000 meters) above the ground.
What is the potential energy of a kilograms person that is W meters above ground?
The potential energy of a person standing W meters above the ground can be calculated using the formula: Potential energy = mass x gravity x height, where mass is in kilograms, gravity is approximately 9.8 m/s^2, and height is in meters.
The distance from ground to low clouds?
a couple of hundred meters above sea level (can be less or more)
What are the dimensions of the Chrysler building?
319 meters = 1046 feet high 77 floors above ground.
How high are the Rila mountains in Bulgaria?
The peak in Rila called Musalla is at 2925 meters above the ground
A ball dropped from a window strikes the ground 2.00 seconds later how high is the window above the ground?
As , s = ut + 1/2 a t2 , since a ball is dropped , the equation is modified as h = ut + 1/2 g t2 Therefore , h = 0 x t + 1/2 x 9.8 x 22 [ u = 0 ,since the ball is at rest] h = 19.6 meters Height of the window = 19.6 meters
