A clown 2 m tall looks at himself in a full-length mirror (floor-to-ceiling). Where in the mirror must he look to see his feet?
a. 1 m from the floor
b. 50 cm from the floor
c. 25 cm from the floor
d. at the bottom of the mirror
e. 1.5 m from the floor
A
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A 5.00-g lead bullet moving at 440 m/s penetrates a wood block and comes to rest inside the block. If half of its kinetic energy goes into heating the bullet, what is the bullet's change in temperature? The specific heat of lead is 128 J/(kg•K)
A) 94.0 K B) 110 K C) 126 K D) 278 K E) 378 K
A current element (length = 1.0 cm) lies along the x axis with its center at x = 0 and carries a 20-A current in the positive x direction. Consider only the field of this current element and decide which combination of the following statements is correct. 1 . The field at (0, 0, 1.0 m) is in the positive z direction. 2 . The field at (0, 1.0 m, 0) is in the negative y direction. 3 . The field at
(1.0 m, 0, 0) is zero. 4 . The field at (0, 0, 1.0 m) is in the negative y direction. a. 3 and 4 b. 1 and 3 c. 2 and 4 d. 1 and 2 e. None of these
The most massive and densest planets are the terrestrials
a. True b. False Indicate whether the statement is true or false
Transformers: In an ideal transformer, how many turns are necessary in a 110-V primary if the 24-V secondary has 100 turns?
A. 458 B. 240 C. 110 D. 22