I need help with these three questions, thanks
1)The man lifts a box that weght 185N. The box is lifted 0.80m. How much work does the man do on the box?
2) 0.180kg ball falls 2.5m How much work does the force of gravity do on the ball?
a)44J b) .45J c) 1.76J
d)4.4J e) None of these
3) Which of the following gives the temperature to the nearest tenth of a degree.
a) 67.43 b)67 c) 6.743x10^1
d) 67.4 e) None of these
1) & 2)
Work is force times distance
3) Which number is in tenths of a degree?
1) To calculate the work done by the man on the box, you need to use the formula:
Work = Force x Distance
In this case, the force exerted by the man is 185N, and the distance the box is lifted is 0.80m. Plug these values into the formula:
Work = 185N x 0.80m
Multiply 185N by 0.80m to get the work done:
Work = 148 Joules (J)
Therefore, the man does 148 Joules of work on the box.
2) To calculate the work done by the force of gravity on the ball, you need to use the formula:
Work = Force x Distance
In this case, the force of gravity can be calculated using the formula:
Force = Mass x Acceleration due to gravity
Given that the mass of the ball is 0.180kg and the distance it falls is 2.5m, you can calculate the force of gravity:
Force = 0.180kg x 9.8m/s^2 (acceleration due to gravity)
Multiply 0.180kg by 9.8m/s^2 to get the force of gravity:
Force = 1.764 N
Now, plug these values into the work formula:
Work = 1.764N x 2.5m
Multiply 1.764N by 2.5m to get the work done:
Work = 4.41 Joules (J)
Therefore, the force of gravity does 4.41 Joules of work on the ball.
The correct answer is d) 4.4J.
3) To determine the temperature to the nearest tenth of a degree, you need to round the given values to the nearest tenth.
Looking at the options:
a) 67.43 - This already includes the nearest tenth of a degree, so it is a possibility.
b) 67 - This is an exact whole number, but it does not provide the nearest tenth of a degree.
c) 6.743x10^1 - This is scientific notation for 67.43, so it is also a possibility.
d) 67.4 - This includes the nearest tenth of a degree, so it is possible.
e) None of these - This option should be considered if none of the other options accurately represent the temperature to the nearest tenth of a degree.
From the given options, a) 67.43 and d) 67.4 both represent the temperature to the nearest tenth of a degree.