What is the momentum of an electron moving at a speed of 0.90 c?
A. 
B. 
C. 
D. 
E. 
C.
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An object is placed 10 cm in front of a mirror, and an image is formed that has a magnification of 2 . Which of the following statements is false?
a. The focal length of the mirror is 20 cm. b. The image is virtual. c. There is enough information to select the correct answer. d. This is the only true statement.
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?
A cylinder rotating about its axis with a constant angular acceleration of 1.6 rad/s2 starts from rest at t = 0 . At the instant when it has turned through 0.40 radian, what is the magnitude of the total linear acceleration of a point on the rim (radius = 13 cm)?
a. 0.31 m/s2 b. 0.27 m/s2 c. 0.35 m/s2 d. 0.39 m/s2 e. 0.45 m/s2
A metal bar is used to conduct heat. When the temperature at one end is 88.0°C and at the other is 15.0°C, heat is transferred at a rate of 19.0 J/s. The bar is then stretched uniformly to twice its original length. If again it has ends at 88.0°C and 15.0°C, at what rate will heat be transferred between it ends?
a. 4.75 J/s b. 9.50 J/s c. 19.0 J/s d. 38.0 J/s e. 76.0 J/s