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The ladder's center of gravity lies halfway between the top and bottom ends. (a) What is the net torque acting on the ladder? (b) What is the ladder's moment of inertia?
A solid cylindrical disk has a radius of 0.19 m. It is mounted to an axle that is perpendicular to the circular end at its center. When a 54-N force is applied tangentially to the disk, perpendicula
Suppose Earth and Mars are positioned such that Earth lies on a straight line between Mars and the Sun. Exactly 365.26 days later, when the Earth has completed one orbit, what is the angle between t
A straight 1.79mm diameter copper wire can just "float" horizontally in air because of the force of the Earth's magnetic field B which has a component that is horizontal, perpendicular to the wire,
In an isometric exercise a person places a hand on a scale and pushes vertically downward, keeping the forearm horizontal. This is possible because the triceps muscle applies an upward force M perpe
Suppose you are riding a stationary exercise bicycle, and the electronic meter indicates that the wheel is rotating at 13.3 rad/s. The wheel has a radius of 0.480 m. If you ride the bike for 25.5 mi
The excited gases in the tubes you used also produced spectral lines in the ultraviolet and the infrared. These are not visible to our eyes, but could be view by other means. Where would these lines
Compare the angular separation between two adjacent lines in the helium spectrum in the first and second order. Which was greater? Which was brighter, the first or second order spectrum? Discuss the
A tandem bicycle team must overcome a force of 165 N to maintain a speed of 9.00 m/s. Find the power required by each of the two riders assuming that they contribute equally.
A point particle that has a charge of +2.90 µC is released from rest at the origin. What is the change in the electric potential energy of the particle as it travels from the x = 0.00 m plane
What is the angular speed of the rod just before it strikes the floor? (Hint: Consider using the principle of conservation of mechanical energy.)
A car in an amusement park ride begins at a height of h and travels along a frictionless track before entering a loop with a radius of 20.0 m. Find the minimum height of h so that the car does not f
By how many kilograms does the mass of the nuclear fuel decrease in one year? (Assume an efficiency of 35 percent for a nuclear power plant.)
(a) What is the angular speed (the magnitude of the angular velocity) of this bacterial motor? (b) How long does it take the motor to make one revolution?
A wind turbine is initially spinning at a constant angular speed. As the wind's strength gradually increases, the turbine experiences a constant angular acceleration 0.169 rad/s2.
Suppose there is a room background of 21 counts per minute. If you count the signal and background rate for 10 minutes each, what is the percent error of the net counting rate?
A singly charged ion of unknown mass moves in a circle of radius 12.5 cm in a magnetic field of 1.2T. The ion was accelerated through a potential difference of 7.0 kV before it entered the magnetic
What is the skateboard's velocity relative to the sidewalk at this instant? Be sure to include the correct algebraic sign with your answer.
The electric repulsion force between the protons is huge, but the attractive nuclear force is even stronger and keeps the nucleus from bursting apart. What is the magnitude of the electric force bet
Ashley's mass is 67 kg, and Miranda's is 52 kg. Ignore the mass of the inner tube and any friction between the inner tube and the snow.
(a) What is the total momentum of the system of the two carts at this instant? (b) What was the velocity of the first cart when the second cart was still at rest?
What is the average velocity of the student during his walking? What is the average speed that the student was moving?
Unpolarized light passes through two polarizers in turn with polarization axes at 50° to one another. What is the fraction of the incident light intensity that is transmitted?
After the collision, the 0.228 kg puck has a speed of 1.96 m/s at an angle of 26 to the positive x axis. Determine the velocity of the 0.391 kg puck after the collision.
A diver jumps from rest at the top of a platform that is h = 6.0 m above the surface of a pool. She penetrates the water to a depth d = 2.5 m before coming to rest again. Her mass is m = 55 kg. Fin