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An astronaut has a heart rate of 65 beats/min as measured with monitor on the spaceship. What will the heart rate be as measured with an earth observer when the astronaut’s spaceship goes by the earth at a speed of 0.60 c?
An object of mass 2.98 kg, moving with an initial velocity of 4.97 m/s, collides with and sticks to an object of mass 2.54 kg with an initial velocity of -3.92 m/s. Find the final velocity of the composite object
At the beginning of a new school term, a student moves a box of blocks by attaching a rope to the box and pulling with a force of F= 84.9N at an angle of 65 degrees, as shown in the figure. The acceleration of gravity is 9.8 m/s2.
A hot-air balloon plus cargo has a mass of 1740kg and a volume of 11730m3. What is the density of the hot air in the balloon
A block (mass m1) lying on a frictionless inclined plane is connected to a mass m2 by a massless cord passing over a pulley.
how long will it take a sample of polonium-210 with a half-life of 140 days to decay to one-sixteenth of its original
A person pushes a 16.0 kg shopping cart at a constant velocity for a distance of 30.0 m. She pushes in a direction 26.0° below the horizontal. Determine the work done by the gravitational force
A 72 kg meteorite buries itself 5.0 m into soft mud. The force between the meteorite and the mud is given by , What was the speed of the meteorite
a. 1.6m long string fixed at both ends vibrates at resonant frequencies of 780hz and 1040hz with no other resonant
Estimate, in vacuum wavelengths, the thickness of a vacuum layer which would permit appreciable tunneling for light incident at 42 degrees and for light incident at 4 degrees.
The potential at location A is 478 V. A positively charged particle is released there from rest and arrives at location B with a speed vB, Find the potential at B
A quarterback takes the ball from the line of scrimmage, runs backwards for 5.0 yards, and then runs sideways parallel to the line of scrimmage for 21.0 yards. Find the magnitude of the ball's resultant displacement
An SUV of mass 1.80 * 103 kg is traveling eastboundat 15m/s when it collides witha compact car (mass 900 kg )traveling westbound at -15 m/s. What is the change in kinetic energy of the two-car system
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