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Q1. A block of wood has specific gravity 0.80. While placed in water, what percent of the volume of the wood is above surface?
Q2. When a wood shelf of mass 6.20 kg is fastened inside a slot in a vertical support, support exerts a torque on the shelf.
Q3. Galaxies form by gravitational collapse of regions that are denser than average. Noting that the present day average mass density of the universe is ρ = 3 × 10-30 g/cm-3, estimate how long it takes for a galaxy to collapse. Hint: You only require assuming a density for the region before collapse, even though your estimate will be uncertain by a factor of order unity. Does your answer make sense compared to the age of the universe? If there is the conflict, what assumptions might you improve in order to reconcile it?
A 29.0 kg sled is being pulled across a horizontal surface at a constant velocity. The pulling force has a magnitude of 85.0 N and is directed at the angle of 30.0° above the horizontal. Find out the coefficient of kinetic friction.
How to find out potential energy
What will transform in terms of the observable properties of the black hole as this process continues
A 3.60-{rm m}-long, 430 {rm kg} steel beam extends horizontally from the point where it has been bolted to the framework of a new building under construction. A 66.0 {rm kg} construction worker stands at the far end of the beam. What is the magnitude..
Assume that a 16.5 m/s wind is blowing across the roof of your house. The density of air is 1.29 kg/m3. Conclude the reduction in pressure (below atmospheric pressure of stationary air) that accompanies this wind.
Find out the velocity of the rain
Two 12-cm-diameter charged rings face each other, 17.0 apart. Both rings are charged to + 40.0. What is the electric field strength at the midpoint between two rings.
As a function of time t, force component Fx that acts on a 3.00 kg ice block that can move only along the x axis. At t=0, the block is moving in positive direction of the axis, with a speed of 3.0 m/s. what are its (a) speed and (b) direction of trav..
What is an angular acceleration
Estimation instantaneous rate of evaporation
The latent heat of fusion
What is the change in length of the rope whilst the skier has the acceleration whose magnitude is 0.65 m/s2.
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