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the astronaut whose heart rate on earth is 65 per minute increase his velocity to v=.95c. what is now his heart rate as measured by an earth observer?
A particle undergoes two displacements. The first has a magnitude of 119 cm and makes an angle of 106 degrees with the positive x axis. The resultant displacement has a magnitude of 111 cm and is directed at an angle of 37.7 degrees to the positive x..
What is the size of the gravitational force that the Earth exerts on the Moon.
A migrating bird is initially flying south at 10 m/s. To avoid hitting a high-rise building, What is the bird's average acceleration during this 2 s interval
A chipmunk scampers about collecting in its cheeks safflower seeds that the birds dropped from the feeder hanging overhead. Initially the little creature is at position vector r1x = 2.45 m and r1y = -2.13 m. After filling up, it runs to the hole a..
Due to the wave nature of light, light shined on a single slit will produce a diffraction pattern, What is the width of the first order fringe
What is the rms current in a series RC circuit if R = 5.4 k-ohms, C = 0.95 µF, and the rms applied voltage is 110 V at 60 Hz
Find the thermal efficiency and the specific work of a simple Rankine cycle if the maxium temperature and pressure are 1050oC and 5.0 MPa and the minimum pressure is 20 kPa.
problem 1two horses pull horizontally on ropes attached to a stump. the two forces texttipvec f1f1vec 1230rm n and
A ball falls straight down onto a wedge that is sitting on frictionless ice. The ball has a mass of 3.21 kg, what is the velocity of the ball after the collision
A weightlifter lifts 50 kg a total vertical distance of 0.28 m at a constant speed in 1.00 seconds. What power was exerted
A block starting atop a frictionless hemispherical dome starts sliding from rest. Write down the two equations of motion of the block in terms of r and ? (i.e. use polar coordinates).
An alpha particle (alpha), which is the same as a helium-4 nucleus, is momentarily at rest in a region of space occupied by an electric field. What is the final velocity of the alpha particle
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