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Physics Samples

Star illumination

When we look at stars in the sky, we see a wide range of brightness. What factors determine how bright a star will be?

A 50 g ball of putty

A 50 g ball of puty moving with a velocity of 3.0 m/s has an inelastic collision head on with a stationary mass of 50 g and sticks to it. find the velocity of the mass and putty after the collision a. 1.7 m/s b. 1.1 m/s c. 1.5 m/s d. 1.3 m/s

Relative Motion For a Child in a Stream

A child in danger of drowning in a river is being carried downstream by a current that flows uniformly with a speed of 2.5 km/h. The child is 0.6 km from shore and 0.8 km upstream of a boat landing when a rescue boat sets out. a) If the boat proceeds at its maximum speed of 20 km/h with respect to the water, what heading relative to the shore should the boatman take? b) What angle does the boat velocity v make with the shore? c) How long will it take the boat to reach the child?

Angular Displacement and Motion

1. The angular displacement of a human centrifuge, of length 30 ft, is given by (theta)= 4[t + 30*e^(-.03t)-30]radians where t is in seconds and and t=0 is start up. If the passenger loses consciousness at an acceleration of 10g's determine the time this would occur. Verify the tangential acceleration is small compared to the radial acceleration. 2. A rocket is fired vertically and achieves a velocity of 27000 km/hr at an altitude of 350km where it's fuel is exhausted. How high does the rocket reach before starting it's decent? 3. Just after being struck by a club a golf ball has a velocity of 125ft/sec at an angle of 35 degrees above the horizontal. Where is the point of ...