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A force of 50 N applied on a machine produces a power output of 500 W. Find the velocity created due to the force
A uniform plank AB, of weight W, is 10 m long. A force of 30 N is applied at end A and the plank is balanced on a pivot placed 2 m from end A. Given that the plank is in equilibrium, calculate the weight of the plank.
You turned the knob of a 196.3 cm by 109.1 cm door (with a mass of 9.88 kg) and pushed it with a perpendicular force of 9.46N to open it. What is the angular acceleration of the door (in rad/s2)?
You turned the knob of a 194.22 cm by 103.86 cm door (with a mass of 9.05 kg) and pushed it with a perpendicular force of 5.18N to open it. What is the approximate torque on the door in (N⋅m)?
An asteroid (mass= one-tenth of the Earth's mass, radius= one-twentieth of the Earth's radius) spins with constant angular velocity if 289 revolutions per day and is on a rotational collision with Earth. Assuming inelastic collision, what is the common final angular velocity (in rev/day) of the Earth-asteroid system? Assume the two objects are solid spheres.
mEarth= 5.97x1024kg, rEarth= 6.37x106m
Three cubic meter of air at a pressure of 20 kPag is compressed at constant temperature to a pressure of 425 kPag. Calculate the final volume of the air.
Someone goes skiing. He starts from rest at the top of a ski hill with an incline of 22 degrees up from the ground. If this person is going 26 m/s after 10 seconds, what is the coefficient of friction between his skis and the hill?
One kilogram of water at 5˚C is heated to 100˚C. Compute its change in entropy. Assume that the specific heat of water is constant at 4190 J/kg·K over this temperature range
If you can do the same amount of work over a shorter period compared to your classmate, in physics, are more powerful?
A. No, because you accomplished the same amount of work.
B. No, because power is concerned with force, not time.
C. Yes, because you accomplished the same amount of work in a small
period.
D. Yes, because power is relative and having yourself as a reference
frame makes you more powerful.
A weightlifter holds a 100kg barbell stationary in the air. While they are
holding up the barbell, what is the value of the work they are exerting?
A. Positive C. Zero / No value
B. Negative D. Can’t be determined
