A 55-cm steel rod has a diameter of 30 cm. The compressive strength of steel is 500 × 106 N/m2. What is the compression force that would break the rod?
A)
3.5 × 107 N
B)
2.4 × 107 N
C)
1.4 × 108 N
D)
4.7 × 108 N
E)
8.9 × 108 N
A
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A golfer hits a ball on a level fairway at an angle of 60° relative to the horizontal, and it lands on the green. Another golfer hits a ball with the same speed but at another angle, and it lands on the green by the other ball. What was the launch angle for the second golfer?
a. 30° b. 20° c. 45° d. 40° e. 10°
Interstellar gas is composed of:
A) only hydrogen. B) 90% hydrogen, 9% helium by weight. C) 10% hydrogen, 90% helium by numbers of atoms. D) some hydrogen, but mainly carbon dioxide. E) ammonia, methane, and water vapor.
A proton's rest mass is 1.67 × 10?27 kg. Calculate its total energy when it is accelerated to a speed of 0.80c.
A. 1.5 × 10?10 J B. 1.0 × 10?10 J C. 2.5 × 10?10 J D. 2.0 × 10?10 J E. 7.5 × 10?10 J
A projectile leaves the ground at 150 m/s and reaches a maximum height of 0.57 km. If there was no air, at what angle above the horizontal did it leave the ground?
What will be an ideal response?