In a wind tunnel the pressure on the top surface of a model airplane wing is 8.8 × 10^4 N/m and the pressure on the bottom surface is 9.0 × 10^4 N/m2 . If the area of the top and bottom surfaces of each wing is 2.0 m2, what is the total lift on the model airplane?
a. 2.0 × 10^3 N
b. 8.0 × 10^3 N
c. 1.6 × 10^4 N
d. 3.6 × 10^4 N
e. 1.0 × 10^3 N
b
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a. the momentum b. the energy c. the velocity d. all of the above properties e. only properties (a) and (b)
Twenty grams of a solid at 70°C is place in 100 grams of a fluid at 20°C. Thermal equilibrium is reached at 30°C. The specific heat of the solid:
a. is equal to that of the fluid. b. is less than that of the fluid. c. is more than that of the fluid. d. cannot be compared to that of a material in a different phase.
A particle (mass = 5.0 g, charge = 40 mC) moves in a region of space where the electric field is uniform and is given by Ex = ?5.5 N/C, Ey = Ez = 0. If the position and velocity of the particle at t = 0 are given by x = y = z = 0 and vx = 50 m/s, vy = vz = 0, what is the distance from the origin to the particle at t = 2.0 s?
A. 60 m B. 28 m C. 44 m D. 12 m E. 88 m
Light spreads out when it passes through a narrow slit because of interference
Indicate whether the statement is true or false