A dog exerts a force of 30N to move a wagon 2m in 5s. What is the power of the dog? help me
2 answers:
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Answer:
For the complete question provided in explanation, if the elevator moves upward, then the apparent weight will be 1035 N. While for downward motion the apparent weight will be 435 N.
Explanation:
The question is incomplete. The complete question contains a velocity graph provided in the attachment. This is the velocity graph for an elevator having a passenger of 75 kg.
From the slope of graph it is clear that acceleration at t = 1 sec is given as:
Acceleration = a = (4-0)m/s / (1-0)s = 4 m/s^2
Now, there are two cases:
1- Elevator moving up
2- Elevator moving down
For upward motion:
Apparent Weight = m(g + a)
Apparent Weight = (75 kg)(9.8 + 4)m/s^2
<u>Apparent Weight = 1035 N</u>
For downward motion:
Apparent Weight = m(g - a)
Apparent Weight = (75 kg)(9.8 - 4)m/s^2
<u>Apparent Weight = 435 N</u>
Answer:
1029 Jkg⁻¹
Explanation:
= height dropped by the water falling = 105 m
= acceleration due to gravity = 9.8 ms⁻²
= mass of water
Using conservation of energy, the internal energy produced is same as the gravitational potential energy lost, hence
Internal energy = Gravitational potential energy