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1) An astronaut in training is placed in a merry-go-round-likedevice that rotates her at high speed in a horizontal circle ofradius 5 m. At what rate does she have to rotate (revolutions persecond) so that her centripetal acceleration is 10g.
2) A box of mass 5 kgis accelerated by a force across a frictionless surface at a rateof 2 m/s2 for 10 s. The work done by the force is?
A moving particle encounters an external electric field that decreases its kinetic energy from 9520 eV to 7060 eV as the particle moves from position A to position B. the electric potential at A is -55.0V and the electric potential at B is +27.0V.
a spaceship travels in a circular orbit around a planet. it applies a sudden thrust and increases its speed by a factor
A space station, in the form of a wheel 184 m in diameter, rotates to provide an "artificial gravity" of 7.40 m/s2 for persons who walk around on the outer rim. Find the rotational frequency of wheel (in revolutions per minute) that will produce t..
q1. a conveyor belt at a quarry lifts 2000 kg of sand per minute up a vertical distance of 12 meters. the sand is at
julie carries an 8.0 kg suitcase as she walks 18 m along a horizontal walkway to her hotel room at constant speed of
a magnifying glass creates a virtual image of the observed object. explain how it is possible that humans can see the
A person pushes a crate rightward along a rough horizontal surface by pushing downward at 30 degrees below the horizontal with a force of magnitude F = 50.0 (N). What is the horizontal acceleration ax of the crate
A gas is compressed at a constant pressure of 0.800 atmfrom 7.00 L to 3.00 L. In the process, 400 J of energy leaves the gas by heat. What is the work done on the gas? What is the change in its internal energy?
Suppose a star with radius 8.39 multiply.gif 108 m has a peak wavelength of 686 nm in the spectrum of its emitted radiation. compute the surface temperature of the star
a 9.05 kg monkey is hanging by one arm from a branch and swinging on a vertical circle. as an approximation assume that
You want to precut a set of 1.51 ohm strips of 14.0 gauge copper wire (of diameter 1.628 mm ). How long should each strip be
A lamp which is 11.5 cm tall is in front of a concave mirror which has a focal length of 66.0 cm. How tall is the lamp's image if the lamp is a distance of 39.6 cm from the mirror
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