Al the astronaut has a mass of 90 kg and a weight of 900 N when he is standing on Earth's surface. What is his mass when he is in a space station orbiting Earth with a radius of three Earth radii?
A. zero
B. 90 kg
C. 30 kg
D. 10 kg
Ans: B. 90 kg
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A 120-kg mass rests on a horizontal surface. What is the magnitude of the normal force exerted by the surface on the mass?
What will be an ideal response?
Charge of uniform density (80 nC/m3) is distributed throughout a hollow cylindrical region formed by two coaxial cylindrical surfaces of radii 1.0 mm and 3.0 mm. Determine the magnitude of the electric field at a point which is 4.0 mm from the symmetry axis.
A. 7.9 N/C B. 10 N/C C. 9.0 N/C D. 8.9 N/C E. 17 N/C
The basic function of an automobile's carburetor is to atomize the gasoline and mix it with air to promote rapid combustion. Assume that 40 cm3 of gasoline is atomized into N spherical droplets. Each droplet has a radius of 2.0 × 10^-5 m. Find the total surface area of these N spherical droplets
a. 60,000 cm2 c. 20,000 cm2 b. 24,000 cm2 d. 2800 cm2
Tests using a thermal probe in a laboratory setting to determine the thermal conductivity of a granular material, earth, as shown in the figure are limited by the diameter of the container. Estimate the minimum diameter of the container of sample, D, for a test run for 3 minutes. Assume the thermal diffusivity is 5 x 10^-6m^2/s.
