How much energy is released in the reaction 2H + 2H ? 4He? [m(2H) = 2.012102 u, m(4He) = 4.002603 u]
A) 20 MeV
B) 18 MeV
C) 13 MeV
D) 12 MeV
E) 36 MeV
A
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When we measure the mass of a planet using the Doppler shift method, we know that it is mass
A) could well be smaller B) could be larger or smaller C) is exactly as measured D) could well be larger
A girl pushes a cart to the left with a 100-N force. At the same time a boy pushes it to the right with a 50-N force. The net force exerted on the cart is
A) 50 N to the left. B) 50 N to the right. C) 100 N to the left. D) 100 N to the right.
An electron moves with a speed of 3.0 × 104 m/s perpendicular to a uniform magnetic field of 0.40 T. What is the magnitude of the magnetic force on the electron? (e = 1.60 × 10-19 C)
A) 4.8 × 10-14 N B) 1.9 × 10-15 N C) 5 × 10-20 N D) 0 N E) 2.2 × 10-24 N
The pressure inside a commercial airliner is maintained at 1 ATM (1.01 × 10^5 N/m2). What is the outward force exerted on a 1.0 m × 2.0 m cabin door if the outside pressure (at 10 km height) is 0.3 ATM?
a. 1.4 × 10^2 N b. 1.4 × 10^3 N c. 1.4 × 10^4 N d. 1.4 × 10^5 N e. 7.0 × 10^3 N