Two carts (A's mass = 4.5 kg and B's mass = 1.5 kg) are held against a strong, compressed spring. The carts are released simultaneously, and B moves off to the right with a speed of 2.0 m/s. What is A's initial velocity?
0.67 m/s to the left
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Estimate the temperature distribution in a stainless steel rod, 1 inch in diameter that is 1 yard long with 3 inches of one end submerged in water at 40ºF and the other end held by a person. Assume the person’s skin temperature is 82ºF, the temperature in the rod is uniform at any point in the rod, and steady state conditions are present.
What will be an ideal response?
The sun subtends an angle of 0.00928 rad when viewed from the surface of the earth, and its distance from Earth is 1.5 × 1011 m. What is the diameter of the sun?
What will be an ideal response?
A 60-kg skier pushes off the top of a frictionless hill with an initial speed of 4.0 m/s. How fast will she be moving after dropping 10 m in elevation? Air resistance is negligible
A) 10 m/s B) 15 m/s C) 0.15 km/s D) 0.20 km/s E) 49 m/s
An unfueled 1000-kg experimental rocket sled on level frictionless rails is loaded with 50 kg of propellant. It exhausts the propellant in a 20 s "burn.". If the rocket, initially at rest, moves at 160 m/s after the burn, what impulse is experienced by the rocket sled?
a. 1.1 × 10^5 kg•m/s c. 1.5 × 10^5 kg•m/s b. 1.6 × 10^5 kg•m/s d. 1.9 × 10^5 kg•m/s