A 5.00-m-long ladder, weighing 200 N, rests against a smooth vertical wall with its base on a horizontal rough floor, a distance of 1.20 m away from the wall
The center of mass of the ladder is 2.50 m from its base, and the coefficient of static friction between the ladder and the floor is 0.200. How far up the ladder, measured along the ladder, can a 600-N person climb before the ladder begins to slip?
A) 1.50 m
B) 1.26 m
C) 1.05 m
D) 3.95 m
E) 4.56 m
E
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A photosensitive surface is illuminated with both blue and violet light. The light that causes the greater number of ejected electrons is
A) blue light. B) violet light. C) both eject equal numbers. D) need more information
As a 70-kg person stands at the seashore gazing at the tides (which are caused by the Moon), how large is the gravitational force exerted on that person by the Moon?
The mass of the Moon is 7.35 × 1022 kg, the distance to the Moon is 3.82 × 108 m, and G = 6.67 × 10-11 N ? m2/kg2. A) 0.24 N B) 0.024 N C) 0.0024 N D) 0.00024 N
While observing the Sun, you note a large number of sunspots. What can you conclude?
A) The Sun is less luminous than usual. B) This is a period of low solar activity. C) Earth's climate will be unusually cold. D) The Sun's rotation is slower than average. E) There are likely to be an above average number of flares and prominences.
Assuming negligible friction, what spring constant would be needed by the spring in a "B-B gun" to fire a 10-g pellet to a height of 100 m if the spring is initially compressed by 0.10 m?
A) 20 N/cm B) 20 N/m C) 200 N/m D) 2000 N/cm E) 0.0020 N/m