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An elderly sailor is shipwrecked on a desert island but manages to save his eyeglasses. How far apart are the lenses when the telescope is adjusted for minimum eyestrain
A 0.54 cm high object is placed 8.7 cm in front of a diverging lens whose focal length is -7.5 cm. What is the height of the image
An evacuated spherical diving bell containing a camera is in the ocean at a depth of 187 m. Find the magnitude of the total force on the port
A spaceship travels at a speed of 0.90c to a star that is 9.0 ly away. what is the distance travelled during the trip
A person wears a hearing aid that uniformly increases the intensity level of all audible frequencies of sound by 34.0 dB. What is the intensity delivered to the eardrum
What is the direction of the induced current in resistor R when the bar magnet is moving from right to left
A simple pendulum consists of a ball of mass 5.00 kg hanging from a uniform string of mass 0.0510 kg and length L, determine the speed of a transverse wave in the string when the pendulum hangs vertic
A beam of red light, whose frequency is 4.30*10^14, passes through a piece of dense flint glass (n=2.13) in 25 ps (picoseconds). Find the thickness of the glass
Calculate the efficiency of a fossil-fuel power plant that consumes 450 metric tons of coal each hour to produce useful work at the rate of 900 MW
A stone is dropped from rest into a well. The sound of the splash is heard exactly 1.60 s later. Find the depth of the well
A projectile is fired vertically from Earth's surface with an initial speed of 9.6 km/s. Neglecting air drag, how far above the surface of Earth will it go
An electron is released to accelerate from point 1 to point 2 in a potential region. The electric potentials at these points are V1 = -35 V and V2 = +200 V. Calculate the change in potential energy
A step-down transformer is used for recharging the batteries of portable devices. calculate rms output voltage of the transformer
The record for the highest speed achieved in a laboratory for a uniformly rotating object was 2.01e3m/s for a 0.15m long carbon rod
A system consists of 3.0 kg water at 80 degrees Celsius 30 J of work is done on the system by stirring with a paddel wheel, What is the change in internal enery of the system
A light ray passes from water into air. The angle of incidence is 37o. Find the angle of refraction in the air
If the crate was at rest at the top of the incline and has a speed of 2.20m/s at the bottom, how much work Wf was done on the crate by friction
One end of a 30 cm long aluminum rod with diameter 2 cm is kept at 460*C while the other end is held in water at 25*C
A particle moving with simple harmonic motion has a maximum displacement of +12.0 cm. Calculate time for the particle to move directly to x = -6.00 cm
When people exercise they shed heat to the environment by sweating and radiating, calculate the rise in body temperature after one hour
Four rays of light are incident on a surface of water. Their angles of incidence are 20, 30, 45, y 60 degrees. Calculate the angle of refraction for each ray
a sound wave traveling in 26 degrees C air has a pressure amplitude of 0.500 Pa. (assume that the density of air is 1.29 kg/m^3). What is the intensity of the wave
A 60-kg skier starts from rest from the top of a 50-m high slope. If the work done by friction is -6.0 15) x 103 J, what is the speed of the skier
An electron has a speed of 0.750c. Find the speed of a proton that has the same kinetic energy as the electron
An object is placed to the left of a convex lens and on the optical axis. find the magnification of the image formed by the lens