An electron, initially at rest, accelerates through a potential difference of 1 V, gaining kinetic energy KEe, while a proton, also initially at rest, accelerates through a potential difference of –1 V, gaining kinetic energy KEp, which of the following relationships holds?
1. KEe = KEp
2. KEe < KEp
3. KEe > KEp
4.The answer can’t be determined from the given information
1
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A container with rigid walls is filled with 4.00 mol of air at 17°C with CV = 2.5R. What is the final temperature of the air if its internal energy is increased by 28 kJ? (R = 8.31 J/mol ? K)
A) 337°C B) 354°C C) 337 K D) 354 K E) 610 K
The intensity of radiation reaching the earth from the sun is 1 350 W/m2 . The earth's radius is 6.4 × 10^6 m. How big a force does this radiation exert on the earth? (Assume it is all absorbed.)
a. 5.8 × 10^8 N b. 1.2 × 10^9 N c. 2.3 × 10^9 N d. 4.6 × 10^9 N e. 1.7 × 10^17 N
Lens-Maker Formula: As part of a piece of optical apparatus to be used in air, you need to design a thin lens having faces with radii of curvature of magnitude 24 cm each. When an object 32 mm tall is placed 30 cm from this lens, it must form a real image 60 cm from the lens.(a) What must be the index of refraction of the lens material?(b) What is the height of the image of the object? Is it upright or inverted; is it real or virtual?
What will be an ideal response?
Mild, short-term cooling periods during the Earth's history are known as
A) ice storms B) nuclear winters C) snowball Earth D) ice ages