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. Work is the dot product of force and distance. What force is neede to lift the box?
2. The force of gravity here is F= (mass of the ball) times (acceleration of gravity). The work is that force through 2.5 meters.
1) To find the work done by the man on the box, we can use the formula:
Work = Force x Distance
In this case, the force is the weight of the box, which is 185N, and the distance is the height the box is lifted, which is 0.80m.
Substituting the values into the formula, we get:
Work = 185N x 0.80m
Multiplying these values, we get the work done by the man on the box:
Work = 148 Joules
Therefore, the man does 148 Joules of work on the box.
2) To find the work done by the force of gravity on the ball, we can use the formula:
Work = Force x Distance
In this case, the force is the weight of the ball, which can be calculated using the formula:
Weight = Mass x Acceleration due to gravity
The mass of the ball is 0.180kg, and the acceleration due to gravity is approximately 9.8 m/s^2.
Weight = 0.180kg x 9.8 m/s^2
Weight ≈ 1.764 N
Now, we can substitute the weight and the distance (2.5m) into the formula for work:
Work = 1.764N x 2.5m
Multiplying these values, we get:
Work ≈ 4.41 Joules
Therefore, the force of gravity does approximately 4.41 Joules of work on the ball.
3) To determine which of the given options gives the temperature to the nearest tenth of a degree, we need to examine the options:
a) 67.43
b) 67
c) 6.743x10^1
d) 67.4
The option that gives the temperature to the nearest tenth of a degree is "d) 67.4". This option represents a temperature of 67.4 degrees.
Therefore, the temperature to the nearest tenth of a degree is 67.4 degrees.