The Moon's near side always faces Earth due to
A) the Sun's gravity.
B) the solar wind.
C) Earth's magnetic field.
D) conservation of angular momentum in the solar nebula.
E) Earth's tidal force.
E
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The critical-stress intensity factor KIc for a glass-fiber reinforced epoxy matrix composite is 50 MPa(m)1/2, and the tensile strength is 500 MPa. In a design application, it is expected that the maximum stress is 400 MPa. What size crack could produce fracture of this composite? Assume that the geometrical factor Y is equal to 1.0.
What will be an ideal response?
A steady horizontal force lasting for 2.10 s gives a 1.25 kg object an acceleration of 3.20 m/s2 on a frictionless table. What impulse does this force give to the object?
A) 25.7 kg m/s B) 10.9 kg m/s C) 8.40 kg m/s D) 4.00 kg m/s E) 2.63 kg m/s
How did plant and animal fossils influence the theory of continental drift?
What will be an ideal response?
An x-t graph is drawn for a ball moving in one direction. The graph starts at the origin and at t = 6 s the velocity of the ball is zero. We can be positive that at t = 6 s,
a. the slope of the curve is non-zero. b. the acceleration is constant. c. the ball has stopped. d. none of the above answers is always correct.