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(a) Use Stefan's law to calculate the total power radiated per unit area by a tungsten filament at a temperature of 3000 K. (Assume that the filament is an ideal radiator.)
(b) If the tungsten filament of a light bulb is rated at 75 W, what is the surface area of the filament? (Assume that the main energy loss is due to radiation.)
On a planet far, far away, an astronaut picks up a rock. The rock has a mass of 4.20 , and on this particular planet its weight is 41.8. If the astronaut exerts an upward force of 49.2 on the rock, what is its acceleration?
A block of mass m = 5.0 kg is pulled along a rough horizontal surface by a rope as sketched in the figure below. The tension in the rope is 80 N, Find the work done by friction on the block
Suppose now that you are at rest relative to the raft standing at the rear end except this time the raft is in the middle of the lake moving at a speed of 4.0 m/s. find the raft's speed relative to a stationary observer
As a baseball is being thrown, it goes from 0.0 to 40.0 m/s in 0.17 s. What is the acceleration of the baseball
Consider the system described in the example with m1 = 0.51 kg and m2 = 0.40 kg. If F is sufficiently large, it is clear that the block will accelerate to the right. Find the range of F that allows the system to remain at rest
You combine two thin lenses by placing them in contact so that their axes coincide, forming what is called a compound lens. The focal lengths of the lenses are 24.1 cm and –53.9 cm, respectively. Find the focal length of this compound lens?__________..
If the flywheel on my truck has a mass of 22.8Kg a radius of .4572 meters and is rotating at 250 revolutions per minute
At what distance from a concave spherical mirror of radius 30cm must an object be placed to form an enlarged, inverted image located 60cm from the mirror?
The rotating sprocket tip at the end of the guide bar has a radius of 0.0343 m. Find the angular speed of the sprocket tip
A 4.40 kg ball is dropped from a height of 14.0m above one end of a uniform bar that pivots at its center. The bar has mass 7.50kg, How high will the other ball go after collision
A projectile is fired with an initial speed of 65.8 m/s at an angle of 33.3? above the horizontal on a long flat firing range, Determine the total horizontal distance covered
In a football game, a tackle running at a constant speed of 5 m/s tackles a stationary receiver. What is the speed of the system's center of mass before the collision
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