Sunday
December 8, 2013

# Posts by brett

Total # Posts: 118

Physics
A plumb bob (a mass m hanging on a string) is deflected from the vertical by an angle θ due to a massive mountain. A) Make an estimate of the mass of Mt. Everest, assuming it has the shape of a cone 3910 m high and base of diameter 3910 m. Assume its mass per unit volume ...

Physics
m1v1 = (0.0146)(v1) (vertically downward is neg direction) v1 = √2gh (where h = 1.23) v1 = 4.91 m/s m1v1 = (0.0146)(4.91) = - 0.0717 kg-m/s (Momentum Before Floor) m2v2 = (0.0146)v2 (vertically upward) v2 = √2gh (where h=.665) v2 = 3.61 m/s m2v2 = (0.0146)(3.61) =...

Physics
A 14.6-g marble is dropped from rest onto the floor 1.23 m below. If the marble bounces straight upward to a height of 0.665 m, what is the magnitude of the impulse delivered to the marble by the floor. If the marble had bounced to a height of 0.884 m, what would the magnitude...

Math
Which represents the type of sequence: 12, 22, 30, 36, 41, …? neither arithmetic nor geometric both arithmetic and geometric arithmetic geometric

Physics
A 73.3 kg man steps out a window and falls (from rest) 1.09 m to a sidewalk. What is his speed just before his feet strike the pavement? 4.62 m/s If the man falls with his knees and ankles locked, the only cushion for his fall is a 0.510 cm give in the pads of his feet. Calcul...

physics
Cliff and Will are carrying a uniform 2.0m board of mass 69kg. Will is supporting the board at the end while cliff is 0.6m from the other end as shown in the following figure. Cliff has attached his lunch to his end of the board, and the tension in the string supporting the lu...

physics
What is the rotational speed of the minute hand on a clock? Convert from rad/s to rev/s

physics
A 50 gram ball enters a a pendulum with mass 200 g. The pair then swings up to a height of 10 cm. Find the velocity at which the pair move immediately after the collision. Your answer is incorrect. 1.4 m/s Find the initial velocity of the ball before the collision.

physics
A car of mass 907 kg coasts on a level road, starting with an initial speed of 14.2 m/s and coming to rest 15.2 s later. Find the frictional force acting on the car.

physics
The Earth orbits the Sun once per year.What is the centripetal force keeping the Earth in orbit? T = 1 year (convert to seconds) r = 1.5e+11 meters m = 6e+24 kg

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