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1. A heat engine takes in 1000 J of energy at 1000 K and exhausts 615 J at 200 K. What are the actual and maximum theoretical efficiencies of this heat engine?
2. If a mass on a spring takes 14 s to complete five cycles, what is its period?
3. A mass on a spring bobs up and down over a distance of 29 cm from the top to the bottom of its path four times each second. What are its period and amplitude?
4. A girl with a mass of 40 kg is swinging from a rope with a length of 2.8 m. What is the frequency of her swinging?
5. A periodic wave on a string has a wavelength of 24 cm and a frequency of 2.0 Hz. What is the speed of the wave?
6. What is the distance between adjacent crests of ocean waves that have a frequency of 0.18 Hz if the waves have a speed of 2.6 m/s?
A ball is released from the top of a cliff; it hits the ground 1.6 seconds later. Assuming the ball is a free falling object, how many meters is the cliff above the ground below
A beam of light strikes a sheet of glass at an angle of 57.0deg. with the normal in air. You observe that red light makes an angle of 38.1 degrees with the normal in the glass, What are the speeds of red and violet light in the glass
question1a diver 60 m deep in 10 celcius fresh water exhales a 0.5-cm-diameter bubble.what is bubbles diameter just as
A nonconducting solid sphere of radius 8.20 cm has a uniform volume charge density. What is the sphere's volume charge density
A 98.0-g wooden block is initially at rest on a rough horizontal surface when a 12.6-g bullet is fired horizontally into it, determine the speed of the bullet immediately before impact
0.75mol of argon gas is admitted to an evacuated 70cm3 container at 40 degrees C. estimate the final pressure of the gas
A pesky 1.7-mg mosquito is annoying you as you attempt to study physics in your room, What is the maximum uncertainty in the horizontal position of the mosquito
A second baseman tosses the ball to the first baseman, who catches it at the same level from which it was thrown, What is the y component of the ball's velocity
A curve with a 140 radius on a level road is banked at the correct angle for a speed of 20 . If an automobile rounds this curve at 30 , what is the minimum coefficient of static friction between tires and road needed to prevent skidding.
A 500-g block is released from rest and slides down a frictionless track that begins 2.00 m above the horizontal. At the bottom of the track, What is the velocity of the mass just before it strikes the spring
An electron drops from the {\rm L} shell to the {\rm K} shell and gives off an X-ray with a wavelength of 0.0205 {\rm nm}. What is the atomic number of this atom
A 42.00kg pole vaulter running at 13 m/s vaults over the bar. Her speed when she is above the bar is 1.3 m/s. Avoid air resistance, in addition to any energy absorbed by the pole, and determine her altitude as she crosses the bar.
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