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The electric motor of a model train accelerates the train from rest to 0.820 m/s in 18.5 ms. The total mass of the train is 875 g. Find the average power delivered to the train during the acceleration.
the n = 2 state of hydrogen has a lifetime of about 10^-8 sec. Suppose the atom jumps from the n=2 state to the ground state, what is the uncertainty in the energy of the photon that is emitted
A 23 gram bullet traveling 230m/s penetrates a 2kg block of wood and emerge clearly at 170m/s. If the block is stationary on a frictionless surface when hit, how fast does it move after bullet emerges.
A car coasts (engine off) up a 30 degree grade. If the speed of the car is 25m/s at the bottom of the grade, Compute the time it takes for the car to come to rest
Equal masses of 0 oC ice and 100 oC steam are mixed together to form water. What is the final temperature of the water
calculate the final temperature of the puddle once it settled to equilibrium. (Assume the chamber walls are sufficiently flexible to allow the system to remain isobaric and consider thermal losses/gains from the chamber walls as negligible.)
A car travels straight along the street from the grocery store to the post office
Electrons are located at the points (0,1), (3,4), (1, 2). Find the net electric field at the origin
A microscope has an objective lens with a focal length of 16.22 mm and an eyepiece with a focal length of 9.76 mm. what is the actual diameter of the red blood cell
A certain lightbulb has a tungsten filament with a resistance of 18.0 when cold and 138 when hot. Find the temperature of the hot filament
An instructor wants to use a lens to project a real image of a light bulb onto a screen 2.27 m from the bulb. what focal length lens will be needed
When 3825 J of heat are added to a 0.14-m-long silver bar, its length increases by 4.59 10-3 m. What is the mass of the bar
questionthe cornea of the eye has a radius of curvature of approximately 0.50 cm and the aqueous humour behind it has
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