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1) Is it possible for the frictional force to increase the mechanical energy of a system?
2) How a car's airbag works in terms of momentum? AND in terms of energy?
3) A solid sphere, hoop, and disk (all with same mass and radius) are rolled up an incline with (potentially) different initial speeds. They each reach the same height up the incline. Compare the initial speed that they each enter the incline and explain the order. Why is one greater than another and/or why are they the same?
4) A ball rolls up a ramp which abruptly ends with the ramp dropping straight down. The ball launches off the end of the ramp while still traveling at an upward trajectory, goes through projectile motion, and returns to the same height as the base of the ramp. Ignoring any slowing friction (rolling friction), when the ball returns to the height of the ramp's base, the ball lands with a greater speed than when it entered the ramp.
Yang can focus on objects 150 centimeter away with a relaxed eye. With a full accommodation, she can focus on objects 20 centimeter away. find what will her near point be while wearing her glasses
Suppose your weight has been constant, but then - after being introduced to really good chocolate - you start eating 100 extra food calories (recall, 1 food calorie is really 1kcal or 1000 calories of energy) every day without otherwise adjusting ..
A 15nC charge is moved from a point where V= 210V to a point where V=-30V. How much work is done by the force that moves the charge
A train starts from rest and travels in a straight line with acceleration 1.5 m/s2 for 30 seconds. It then travels with a constant speed for 2 minutes. calculate the average velocity over the duration of the trip
If the sun's intensity on the back of the alligator is 500 W/m2, and if energy losses can be ignored, how long will it take the alligator to warm up from 23oC to a more favorable 30oC? The average specific heat of body tissue is 3400 J/kgK
At 19°C, a rod is exactly 18.07 cm long on a steel ruler. Both the rod and the ruler are placed in an oven at 250°C, What is the coefficient of thermal expansion for the material of which the rod is made
A thin film of alcohol (n = 1.36) lies on a flat glass plate (n =1.51). What is the thickness of the film
An old Chrysler with mass 2200 kg is moving along a straight stretch of road at 86 km/h. How fast (in km/h) is the center of mass of the two cars moving
Objects of equal mass are oscillating up and down in simple harmonic motion on two different vertical springs. The spring constant of spring 1 is 165 N/m. The motion of the object on spring 1 has twice the amplitude as the motion of the object on spr..
The drive propeller of a ship starts from rest and accelerates at 2.70 x 10-3 rad/s2 for 3.10 x 103 s. For the next 1.30 x 103 s the propeller rotates at a constant angular speed. Find the total angular displacement of the propeller
what is the magnitude of its velocity after the collision. A soccer player applies a force of 60.5 N to a soccer ball while kicking it. If the ball has a mass of 0.42kg, what is the acceleration of the soccer ball.
An 8 Ohm speaker is connected across the output terminals of a power amplifier that delivers 72 W. What is the current supplied to the speaker
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