A horizontal force of 1000 N is needed to overcome the force of static friction between a level floor and a 250-kg crate. If g = 9.8 m/s2, what is the coefficient of static friction?
a. 4.0
c. 0.41
b. 0.51
d. 0.31
C
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The ____ depend(s) on the assumption that the mass of a galaxy or galactic cluster is large enough to keep moving matter bound to the main structure
a. rotation curve method b. velocity dispersion and cluster methods c. Shapley-Curtis and Hubble methods d. recessional velocity method e. tangential velocity method
Find the magnetic energy stored in the air gap between two very large magnetic pole pieces, one North, one South, each with an area of 100 cm2. Assume the 0.05-T magnetic field is uniform within the 2-cm gap.
What will be an ideal response?
A 100%-efficient engine is being used to raise a 89-kg crate vertically upward at a steady rate
If the power output of the engine is 1620 W, how long does it take the engine to lift the crate a vertical distance of 18.7 m? Friction in the system is negligible.
Do you think that this experiment confirms the validity of the series resistor equation used in Procedures 2(f), 3(f), and 4(f)?