Answer:
Horizontal Motion, and Vertical Motion.
Explanation:
Answer:
Work done, W = 0 J
Explanation:
It is given that,
Weight of the bucket, W = F = 35 N
It is lifted vertically 3 m and then returned to its original position. We need to find the work gravity do on the bucket during this process.
Work done when the bucket is lifted vertically, W₁ = -mgh
Work done when the bucket returned to its original position, W₂ = +mgh
Net work done, W = W₁ + W₂
W = 0 J
So, the work done on the bucket is zero. Hence, this is the required solution.
Essentially, an increase in mass means an increase in gravity, while a decrease in mass means a decrease in gravity. So if the Sun spontaneously lost half its mass (gasp, shudder, the horror!) then its gravitational pull on Earth would lessen as well, ultimately changing the very nature of our orbit around the Sun.
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Answer:
22 degree
Explanation:
Angle of incidence, i = 30 degree
the refractive index of water with respect to air is 4/3.
As the ray of light travels from rarer medium to denser medium, that mean air to water, the refraction takes place.
According to Snell's law,
Refractive index of water with respect to air = Sin i / Sin r
Where, r be the angle of refraction
4 / 3 = Sin 30 / Sin r
0.75 = 2 Sin r
Sin r = 0.375
r = 22 degree
Thus, the angle of refraction is 22 degree.
Answer:
option C
Explanation:
given,
Period of oxygen molecule = 6 s
number of molecule = 6 x 10²³
Area of wall = 2 cm²
speed of molecule = 400 m/s
mass of O₂ molecule = 5.344 × 10⁻²⁶ Kg
we know,
Δp= F Δt
Δp change in momentum
Δp = N.m.Δv
where N is the number of oxygen molecules strike a wall
Δv = v - (-v)= 2 v
Pressure,
P = 21376 Pa
P = 21.4 kpa
hence the correct answer is option C