A skier, of mass 60. kg, 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?
A) 0.20 km/s
B) 15. m/s
C) 10. m/s
D) 0.15 km/s
E) 49. m/s
B
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Most of the dark matter in the Galaxy lies in the disk and galactic center
Indicate whether the statement is true or false
A book is resting on a table. How many forces would be in the free-body diagram of the book?
a. one b. two of the same type c. two of different types d. three or more of the same type e. three or more of at least two different types
An alpha particle (charge = +2e) is sent at high speed toward a gold nucleus (charge +79e). What is the electrical force acting on the alpha particle when it is at a distance of 2 × 10^?14 m away from the gold nucleus? (e = 1.6 × 10^?19 C)
A long straight wire is parallel to one edge and is in the plane of a single-turn rectangular loop as shown. If the loop is changing width so that the distance x changes at a constant rate of 4.0 cm/s, what is the magnitude of the emf induced in the loop at an instant when x = 6.0 cm? Let a = 2.0 cm, b = 1.2 m, and I = 30 A
a.
5.3 ?V
b.
2.4 ?V
c.
4.8 ?V
d.
2.6 ?V
e.
1.3 ?V