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A heart pacemaker is designed to operate at 71 beats/min using a 9.0 mu F capacitor in a simple RC circuit.
A 16.5-kg sled is being pulled across a horizontal surface at a constant velocity. The pulling force has a magnitude of 83.5 N and is directed at an angle of 30.0° above the horizontal. Determin
A 5kg object of unknown velocity strikes a stationary 7.2kg object. the 5kg object moves off at 5 m/s 42°N of W, while the 7.2 kg object moves off at 2.3 m/s 48° S of W. what is the initial
The water level in a vertical glass tube 0.950 m long can be adjusted to any position in the tube. A tuning fork vibrating at 672.00 Hz is held just over the open top end of the tube. What is the gr
Calculate the rate at which internal energy is produced in 2.10 m of 12-gauge copper wire carrying a current of 20.0 A.
(a) what is the kinetic energy of the block as it passes through x = 2.0 m? (b) what is the maximum kinetic energy of the block between x = 0 and x = 2.0m?
What is the direction (below +x) of the projectile's velocity at the instant it hits the ground?
A ball of mass m makes a head-on elastic collision with a second ball (at rest) and rebounds in the opposite direction with a speed equal to one-fourth its original speed. What is the mass of the se
The reassembled block is set on a rough-surfaced table, and the fuse is lit. When the firecracker explodes, the two blocks separate and slide apart. What is the ratio of distances each block travels
After the collision, assumed elastic, ball B is moving along the positive y axis. What is the final direction of ball A and what are their two speeds?
A 0.700-V potential difference is maintained across a 1.50-m length of tungsten wire that has a cross-sectional area of 0.200 mm2. What is the current in the wire?
If the elevator falls from rest from the top floor of the building at a height h above the top of the spring, the passengers should undergo an acceleration of no more than 4.0 g when brought to rest
What is the ratio of his rotational inertia with his arms out to his rotational inertia with his arms in?
A steam pipe is covered with 1.50 cm thick insulating material with a thermal conductivity of 0.200 cal/cm·°C·s. How much energy is lost every second when the steam is at 190°C
What is the potential difference across the headlight bulbs when they are the only load on the battery?
An object with mass M and speed Vexplodes into two pieces, one 3times as massive as the other; the explosion takes place in a gravity free space. the less massive piece comes to rest. How much kine
A .2kg object moving with a speed of 2m/s collides with an .3kg object then veers off at an angle of 53deg from it's initial direction with a speed of 1m/s. a) what is the speedof the .3kg object af
The electric field between the plates of the velocity selector is 3000 V/m, and the magnetic fields in both the velocity selector and the deflection chamber have magnitudes of 0.0500 T. Calculate th
A child pushes a merry go-round from rest to a final angular speed of 0.44 rev/s with constant angular acceleration. In doing so, the child pushes the merry-go-round 1.2 revolutions. What is the ang
An x-ray beam of wavelength A undergoes first-order reflection from a crystal when its angle of incidence to a crystal face is 27 °, and an x-ray beam of wavelength 96 pm undergoes third-order r
A round reinforcing bar constructed from cold-rolled steel and 280 mm long is required to support a tensile load of 52 kN. Determine the minimum cross-sectional area if the stress cannot exceed 180
A race car starts from rest at point A on a flat, circular track. The driver presses on the gas pedal such that the speed of the car increases at a constant rate of 12 MPH per second. The coefficie
A double-slit experiment is performed and then redone using slits of double the previous separation. Nothing else is changed. If the approxmation sin Q = Q holds, what happens to the angle between t
A beam of protons is moving toward a target in a particle accelerator. This beam consists of 0.50 mA. A) How many protons strike the target in 15 s?
When the cylinder is rotating at 2.1 revolutions per second, what is the magnitude of the centripetal acceleration at the outer wall?