Rotational Kinetic Energy: The L-shaped object shown in the figure consists of three small masses connected by thin uniform rods, each rod of mass 3.00 kg. Assume that the masses shown are accurate to three significant figures. How much work must be done to accelerate the object from rest to an angular speed of 3.25 rad/s about the y-axis?
Fill in the blank(s) with the appropriate word(s).
403 J
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Which of the following is true of the origin of life on Earth?
A) Evidence suggests that the earliest living things contained hard bones and shells. B) The oldest living fossils indicate that life began on land. C) Evidence suggests that the earliest living things were multicellular and gigantic. D) The oldest fossils indicate that life began in the sea.
Resistance and Resistivity: The length of a certain wire is kept same while its radius is doubled. What is the new resistance of this wire?
A. It is increased by a factor of 2. B. It is increased by a factor of 4. C. It is reduced by a factor of 2. D. It is reduced by a factor of 4. E. It is reduced by a factor of 8.
You are heating two chunks of metal of the same size and shape. One is made of lead and is heated to 400 K. The other is made of iron and is also heated to 400 K. Which of the following statements apply to the thermal radiation the two chunks emit?
A) The two spectra peak at the same wavelength. B) The spectra cannot be compared because they come from different materials. C) The lead spectrum peak is at a shorter wavelength than the iron spectrum peak. D) The lead spectrum peak is at a longer wavelength than the iron spectrum peak.
If the communication lifetime of civilizations in our galaxy is 10,000 years and our galaxy is 13 billion years old, what is the chance of us detecting another intelligent civilization now?
A) 1 in 13,000 B) 1 in 1,300,000 C) 1 in 1300 D) 1 in 130,000