A 2500-N pile-driver ram falls 10 m and drives a post 0.1 m into the ground. The average impact force on the ram is
A) 2,500 N.
B) 25,000 N.
C) 250,000 N.
D) 2,500,000 N.
Answer: C
You might also like to view...
A capacitor consisting of two parallel plates separated by 2.0 cm has a potential of 40 V on the top plate and a potential of 0 V on the bottom plate. The electric field in the middle is
A. 80 N/C, upward. B. 2000 N/C, downward. C. 20 N/C, upward. D. 40 N/C, downward.
The mass of the Milky Way Galaxy can be estimated by:
A) the orbital motions of the stars within the galaxy. B) the mass of the planets in the Solar System. C) the luminosity of the stars of the neighboring galaxies. D) the concept laid down by the spiral density wave theory.
Entropy: On a cold winter day, the outside temperature is -20°C and the inside temperature is maintained at 20°C. There is a net heat flow to the outside through the walls, roof, etc., of 25 kW. What is the rate of increase of the entropy of the universe as a result of this heat flow?
A. 13 W/K B. 25 W/K C. 85 W/K D. 99 W/K E. 0 W/K
List the three types of objects a star's core can collapse to, and give the mass limits for each
What will be an ideal response?