Answer:
Explanation:
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Answer:
vx = 65 yd/3 sec = 21.7 yd/sec since horizontal speed is constant
vy = g t = (32 / 3) yd/sec^2 * 1.5 sec = 16 yd/sec where 32/3 is the acceleration due to gravity in yds / sec^2 and 1.5 is the time to travel each way in the vertical direction
V = (vx^2 + vy^2)^1/2 = (21.7^2 + 16^2)^1/2 = 27 yd/sec
tan theta = vy/vx = 16 / 21.7 = .737 theta = 36.4 deg
You can check using the range formula:
R = v^2 sin (2 theta) / g = 27^2 * .955 / (32 / 3) = 65.3 yds
The difference from 65 yds may be rounding error.
Answer:
Explanation:
Let the mass of copper ball is "m" gram
now the total number of copper atom present in the ball is given as
now the total number of electrons in one copper atom is 29
so total number of electrons in given sample of copper ball is
now diameter of the ball is 7.0 mm
density of the ball = 
now we have
now we have
now the charge on the copper ball is 40 nC
so the number of electrons removed
so the fraction of number of electrons removed is given as
Night hunting animals have more rod cells in their retinas which allows them to see better in the dark.
Answer:
Boiling point of water is 100 deg C. It takes about 540 cal to change 1 g of water at the boiling point to 1 g of steam at 100 deg C.
