Coulomb's Law: Consider a container of 2.0 g of hydrogen, H2 (one mole). Suppose you removed all the electrons and moved them to the other side of the earth (Earth's radius is 6380 km, k = 1/4??0 = 9.0 × 109 N ? m2/C2, NA = 6.022 × 1023 molecules/mol, e = 1.60 × 10-19 C)(a) How much charge is left behind after you remove the electrons?(b) What electric force do the protons exert on the electrons after they are separated as described?
What will be an ideal response?
(a) 1.9 × 105 C (b) 2.1 MN
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A stationary but movable 450-kg cannon is fired, and the 12-kg cannonball moves off to the right with a velocity of 20.0 m/s. What is the cannon's velocity (neglecting friction or any restraints)?
If R1 = 3.0 ?, R2 = 6.0 ?, R3 = 12 ?, and I = 0.50 A, at what rate is heat being generated in R1?
a.
20 W
b.
17 W
c.
12 W
d.
31 W
e.
6.0 W
Vision Problems: A person cannot see clearly objects more than 70.0 cm away. What power of corrective lens should be prescribed if the glass is to be worn 1.00 cm in front of the eye?
A. 1.45 diopters B. -1.45 diopters C. 0.0145 diopters D. -0.0145 diopters
Two automobiles traveling at right angles to each other collide and stick together. Car A has a mass of 1200 kg and had a speed of 25 m/s before the collision
Car B has a mass of 1600 kg. The skid marks show that, immediately after the collision, the wreckage was moving in a direction making an angle of 40° with the original direction of car A. What was the speed of car B before the collision? A) 16 m/s B) 18 m/s C) 11 m/s D) 21 m/s E) 14 m/s