An unfueled 1000-kg experimental rocket sled at rest on level frictionless rails is loaded with 50 kg of propellant. It exhausts the propellant in a 20 s "burn.". The rocket moves at 160 m/s after the burn. What average force is experienced by the rocket during the burn?
a. 0.80 × 10^4 N
c. 0.60 × 10^4 N
b. 0.75 × 10^4 N
d. 0.35 × 10^4 N
A
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At the point of fission, a nucleus of U-238, with 92 protons is divided into two smaller spheres each with 46 protons and a radius of 5.9 × 10?15 m. What is the repulsive force pushing the two spheres apart when they are just touching one another? (The mass of the U-238 nucleus is 3.98 × 10?25 kg.)
What will be an ideal response?
What current must be maintained in a square loop (50 cm on a side) to create a torque of 1.0 N ? m about an axis through its center and parallel to one of its sides when a magnetic field of magnitude 70 mT is directed at 40° to the plane of the loop?
A. 66 A B. 89 A C. 61 A D. 75 A E. 37 A
Comet dust particles that later encounter Earth are seen as meteors
a. True b. False Indicate whether the statement is true or false
An ice cube at 0°C is placed in a very large bathtub filled with water at 30°C and allowed to melt, causing no appreciable change in the temperature of the bath water. Which one of the following statements is true?
A) The entropy gained by the ice cube is equal to the entropy lost by the water. B) The entropy lost by the ice cube is equal to the entropy gained by the water. C) The net entropy change of the system (ice plus water) is zero because no heat was added to the system. D) The entropy of the system (ice plus water) increases because the process is irreversible. E) The entropy of the water does not change because its temperature did not change.