The frequency of a body oscillating from a spring on the moon is___________ the frequency of the same body oscillating from the same spring on earth

a. the same as
b. larger than
c. smaller than
d. not related to
e. depending on the mass, smaller or larger than


A

Physics & Space Science

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The stellar parallax limit for ground-based telescopes is accurate for stars closer than ____

a. 10 parsecs b. 50 parsecs c. 100 parsecs d. 200 parsecs e. 500 parsecs

Physics & Space Science

A transformer has 200 turns on its primary and 12 turns on its secondary. If the input voltage is 2000 V, what is the output voltage?

A.
B. 240 V
C. 170 V
D. 120 V
E. 100 V

Physics & Space Science

A line perpendicular to a surface or curve _________

Fill in the blank(s) with the appropriate word(s).

Physics & Space Science

Concrete has a tensile strength of 3×106 Pa and an elastic modulus of 30×109 Pa. Because the concrete fractures in a brittle manner, it is to be reinforced with 10 vol % uniaxial 1020 steel rebar that has a yield strength of 205×106 Pa, and the steel rods have an elastic modulus of 211×109 Pa.

(a) What is the maximum strain that this composite can withstand without the concrete cracking or the rebar yielding? (b) What is the maximum tensile stress applied parallel to the rebar axis that can be withstood by this reinforced concrete before the concrete cracks or the rebar yields? Assume that there is good bonding between the concrete and the rebar.

Physics & Space Science