A football field is 120 yd long and 50 yd wide. What is the area of the football field, in square meters, given that 1.0 yd = 91.44 cm?
A) 2.4 × 103 m2
B) 3.7 × 103 m2
C) 4.2 × 103 m2
D) 5.0 × 103 m2
D
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Refer to Figure 6-13. Block A has a mass of 6.00 kg, block B has a mass of 4.00 kg and block C has a mass of 3.00 kg. The pulleys are ideal and there is no friction between block B and the table. What is the acceleration of the masses?
A. 2.74 m/s2 B. 0 m/s2 C. 1.97 m/s2 D. 2.26 m/s2 E. 0.981 m/s2
Energy Levels: What is the shortest wavelength of a photon that can be emitted by a hydrogen atom, for which the initial state is n = 3? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A. 822 nm B. 850 nm C. 103 nm D. 91.4 nm E. 950 nm
An 80-g particle moving with an initial speed of 50 m/s in the positive x direction strikes and sticks to a 60-g particle moving 50 m/s in the positive y direction. How much kinetic energy is lost in this collision?
a. 96 J b. 89 J c. 175 J d. 86 J e. 110 J
Two identical objects are released from rest from heights R and 2R above the surface of the Earth. After traveling a distance R/2, which object has the larger speed?