Projectile Motion: You throw a rock horizontally off a cliff with a speed of 20 m/s and no significant air resistance. After 2.0 s, the magnitude of the velocity of the rock is closest to
A. 28 m/s
B. 20 m/s
C. 40 m/s
D. 37 m/s
Answer: A
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Which of the following nuclear fuels does a twenty-solar-mass star NOT fuse over the course of its entire evolution?
a. hydrogen b. carbon c. nitrogen d. oxygen e. iron
Metric System: Express the sum 1.00 kg + 1531 g + 2.54 × 104 mg in kilograms with the correct number of significant figures.
A. 2.56 kg B. 27.9 kg C. 2.53 kg D. 2.79 kg
A traffic flow on a freeway is very dense and it is proposed that a fluid flow could possibly simulate the flow. If it was decided to study the feasibility of the proposal, which flow would be a possibility?
(A) An incompressible flow (B) A compressible flow with M < 1 (C) A compressible flow with M > 1 (D) A compressible flow with M = 1
A steel guitar string with a diameter of 0.300 mm and a length of 70.0 cm is stretched by 0.500 mm while being tuned. How much force is needed to stretch the string by this amount? Young's modulus for steel is 2.0 × 1011 N/m2
What will be an ideal response?