A hunter aims a rifle at an angle of 10° below the horizontal. The hunter fires a bullet while simultaneously dropping another bullet from the side of the rifle. The bullet to hit the ground first is
A) the dropped one.
B) the fired one.
C) both hit at the same time
Answer: B
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A 1040 steel specimen has a yield stress of 350 MPa, an ultimate tensile strength of 515 MPa, and an elastic modulus of 211 GPa. The specimen is stressed to 400 MPa. What is the elastic strain energy density in this specimen?
What will be an ideal response?
Suppose Earth collapsed down to one-tenth of its present radius, while retaining all of its present mass. Compared to your present weight, your weight would then be
A) unchanged. B) increased by a factor of 100. C) increased by a factor of 10. D) reduced by a factor of 10. E) reduced by a factor of 100.
What is the parallax angle for Proxima Centauri, which is Earth's nearest star at 4.3 ly?
The earth's orbit has a mean radius of 1.5 × 108 km, and 1 ly = 9.46 × 1015 m. A) 1.2 × 10-7 degrees B) 2.1 × 10-7 degrees C) 1.2 × 10-14 degrees D) 2.1 × 10-4 degrees
The Lewis symbol of which of the following elements has a single dot on each of the four sides of the element's symbol?
a. Helium b. Carbon c. Beryllium d. None of these