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The rotational inertia of a collapsing spinning star changes to 1/4 its initial value. What is the ratio of the new rotational kinetic energy to the initial rotational kinetic energy?
A ball of mass 0.113 kg is dropped from a height of 1.92m above ground. The acceleration of gravity is 9.8m/s^2.Neglecting air resistance determine the speed of the ball when it is at a height of 0
A camera flashtube requires 8.0 J of energy per flash. The flash duration is 2.0 m/ss}.What power does the flashtube use while it's flashing?
A uniform magnetic field given by B=(0.25T)i+(.30T)k, find a)the torque on the loop(in unit vector notation) and b) the magnetic potential energy of the loop.
What is the energy stored in a small battery if it can move 650 C through a potential difference of 1.00 V?
Find a peer reviewed article which discusses the effects of optimism on physical and psychological health. (You may need to find two articles in order to cover both the physical and the psychologic
While rearranging a dorm room, a student does 313 J of work in moving a desk 1.5 m. What was the magnitude of the applied horizontal force?
If the atom does not collide with any other atoms or molecules, how high up would it go before coming to rest? Assume that the acceleration due to gravity is constant throughout the ascent.
How long does the ball take to travel the first half of that distance? (b) The second half? (c) How far does the ball fall freely during the first half? (d) During the second half?
The pressure of the gas is 6.2 X 10^5 Pa. How long would a 0.25-hp engine have to run (1 hp = 746 W) to produce an amount of energy equal to the internal energy of this gas?
Find the shear strain that results if a force of magnitude 1.20×106 is applied to the top square face of the plate, parallel to the side, and a force of equal magnitude is applied in the oppos
Two large metal plates of area 1.2 m2 face each other. They are 4.8 cm apart and have equal but opposite charges on their inner surfaces. The strength of the electric field between them is 63 N/C.
The balloon is filled with helium (He) at a temperature of 305-degrees K and just floats in the air, neither rising nor falling. The density of the surrounding air is 1.19-kg/m^3. Find the absolute
One of the children on the merry-go-round is not holding on tight enough. If the radius of the merry-go-round is 1.3m, and the child falls off the edge at maximum angular velocity of 11rad/s, what
You are hanging on to the edge of a merry-go-round, and must exert a force of 100 N to hang on. If the speed of the merry-go-round doubles, how much force will you need to exert to hang on?
The temperature of this object is raised from 20 to 320-degrees C. How much work is done by the expanding aluminum if the air pressure is 1.01 X 10^5 Pa?
A spherical balloon of volume 4.03 103 cm3 contains helium at a pressure of 1.15 105 Pa. How many moles of helium are in the balloon if the average kinetic energy of the helium atoms is 3.60 10-22 J
A magnetic field near the ceiling points up and is decreasing. Looking up at the ceiling, does the non-Coulomb electric field curl clockwise or counter-clockwise?
The direction 20.0 north of east. In what direction must the pilot head the plane in order to reach her destination? How long will the trip take?
Four point charges have the same magnitude of 2.4 × 10-12 C and are fixed to the corners of a square that is 4.0 cm on a side. Three of the charges are positive and one is negative. Determine
A 1.0cm X 1.0cm parallel-plate capacitor has a 1.0mm spacing. The electric field strength inside the capacitor is 1.4×10^5 V/m. What is the potential difference across the capacitor? How much
An electron has been accelerated from rest through a potential difference of 700V. What is the electron's kinetic energy, in electron volts? What is the electron's kinetic energy, in joules? What i
An airplane is flying with a velocity of 86.0 at an angle of 26.0 above the horizontal. When the plane is a distance 119 directly above a dog that is standing on level ground, a suitcase drops out o
It is in contact with the pavement for 0.01 s and rebounds to a height of 10 m. what is the total change in momentum? what average force is exerted by the pavement on the ball?
A 3.00 liter aluminum cylinder at 5°C is filled to the brim with gasoline at the same temperature. If the aluminum and gasoline are warmed to 67.0°C, how much gasoline spills out?