How many significant figures are in 10,002?
A)
ambiguous
B)
2
C)
3
D)
4
E)
5
E
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Once the helium flash occurs at stage 10, the star stabilizes again on the horizontal branch of the H-R diagram, but now hundreds of times as bright as on the main sequence
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A 1 200-kg experimental rocket sled on level frictionless rails is loaded with 55.0 kg of propellant. It exhausts the propellant in a 20-s "burn." If the rocket, initially at rest, moves at 155 m/s after the burn, what impulse is experienced by the rocket sled?
a. 8.5E+3 kg/m/s b. 1.3E+5 kg/m/s c. 1.9E+5 kg/m/s d. 8.5E+5 kg/m/s e. 2.1E+5 kg/m/s
A person of mass 50 kg has a de Broglie wavelength of 4.4 × 10-36 m while jogging. How fast is she running? (h = 6.626 × 10-34 J ? s)
A) 2.0 m/s B) 3.0 m/s C) 4.0 m/s D) 5.0 m/s
A 600-kg car is going around a curve with a radius of 120 m that is banked at an angle of 25.0° with a speed of 30.0 m/s. The coefficient of static friction between the car and the road is 0.300
What is the force exerted by friction on the car? A) 1590 N B) 3430 N C) 7240 N D) 7820 N E) 795 N