Which of the following explains why, a million years from now, Alpha Centauri will no longer be the nearest star system to our own?
A) Earth rotates once each day.
B) Earth orbits the Sun once each year.
C) The direction of Earth's axis in space precesses with a period of about 26,000 years.
D) Stars appear to move randomly relative to our Sun in the local solar neighborhood.
E) The universe is expanding.
D) Stars appear to move randomly relative to our Sun in the local solar neighborhood.
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Discuss whether any work is being done by each of the following agents and, if so, whether the work is positive or negative
(i) a chicken scratching on the ground (ii) a person studying physics (iii) a crane lifting a bucket of concrete (iv) the gravitational force on the bucket in (iii) (v) the leg muscles of a person in the act of sitting down
1.All of them do work. Positive work is done in cases (i), (ii), and (iii) and negative work is done in cases (iv) and (v). 2.No work is done in case (ii). Positive work is done in cases (i) and (iii) and negative work is done in cases (iv) and (v). 3.No work is done in cases (i) and (ii). Positive work is done in case (iii) and negative work is done in cases (iv) and (v). 4.No work is done in cases (i) and (ii). Positive work is done in cases (iii) and (v) and negative work is done in case (iv).The amplitude of a 3.00-kg object in simple harmonic motion is 6.00 m. The maximum acceleration of the object is 5.00 m/s2. What is the period of simple harmonic motion?
A) 6.88 s B) 1.20 s C) 0.278 s D) 0.833 s E) 7.54 s
A metal block has a density of 5000 kg per cubic meter and a mass of 15,000 kg. What is its volume?
A) 0.33 cubic meters B) 3 cubic meters C) 5 cubic meters D) 15 cubic meters E) none of the above
When the huge polar caps on Mars form every winter, they are made chiefly of ________
Fill in the blank(s) with correct word