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Pretend galaxies are evenly spaced 2.5 Mpc apart and the average mass of a galaxy is 1011 solar masses. What is the average density of matter in the universe? Suppose that the space may be represented as the set of spheres with the diameter equal to the distance between the galaxies, and each galaxy corresponds to one sphere. Hint, use the formula for volume of a sphere and the mass of the Sun is 2×1030 kg. Express your answer in units of kg/m3.
What is the acceleration of the bug in SI units?
a pelican flying along a horizontal path drops a fish from a height of 4.7 m. the fish travels 7.7 m horizontally
A friend of yours who starts out at the same age as you travels to the alpha centauri solar system which is 4.70 light-years away. How fast did she travel
What is the maximum speed with which a 1200 kg car can round a turn of radius 60.0m on a flat road if the coefficient of friction between tires and road is 0.65.
A 30 kg child stands on the edge of a 2.5 m radius, 120 kg merry-go-round. If her speed while she stands on the edge is 1 rev/min, what is the angular momentum of her and the merry-go-round about the center of the merry-go-round?
A medical experiment compares an antidepressant medicine with a placebo for relief of chronic headaches. There are 36 headache patients available to serve as subjects. To choose 18 patients to receive the medicine, you would
Astronomers measure the width of the spectral lines of a star to be much wider than would be measured in a laboratory. Give two stellar characteristics that could produce this widening
The mean radius of the screw of a square-threaded jackscrew is 25 mm. The pitch of the threads is 7.5 mm. If the coefficient of friction is 0.12.
Calculate the magnitude of the acceleration starting from rest if each dog exerts an average force of 185 N backward on the snow
A 86.6-kg sprinter exerts a force of 100 N on the starting block at an angle of 30 with respect to the ground. The horizontal acceleration of the sprinter is
A good quarterback can throw a ball 27 m/s. If we assume that the ball is caught at the same height from which it is thrown, How long is the ball in the air
Find the de Broglie wavelength of the electrons. Find the ratio of this wavelength to the wavelength of light at the middle of the visible spectrum (550 nm).
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