Answer:
2.13 x 10^-19 J or 0.53 eV
Explanation:
cut off wavelength, λo = 700 nm = 700 x 10^-9 m
λ = 400 nm = 400 x 10^-9 m
Use the energy equation
Where, K be the work function
K = 2.13 x 10^-19 J
K = 0.53 eV
A solid sphere of uniform density starts from rest and rolls without slipping down an inclined plane with angle θ = 30o. The sph
1 answer:
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Answer:
d. Two soccer balls that are touching each other
Explanation:
Let be the mass of a tennis ball,
is the mass of a soccer ball.
As the mass of a soccer ball is more than the mass of a tennis ball, so
Let be the distance between the centers of both the balls near each other and
be the distance between the centers of both the balls touching each other.
So,
The gravitational force, F, between the two objects having masses M and m and separated by distance d is
Where G is the universal gravitational constant.
As, the gravitational force is directly proportional to the product of both the masses and inversely proportional to the square of the distance between them, so selecting the larger mass (, soccer ball) separated by a lesser distance (
, touching) to get more gravitational force.
Therefore, there will be a larger gravitational force between them when two soccer balls touching each other.
Hence, option (d) is correct.
Answer:
0.037 N/m
Explanation:
The web acts as a spring, so it obeys Hook's law:
(1)
where
F is the force exerted on the web
k is the spring constant
x is the stretching/compression of the web
In this problem, we have:
- The mass of the fly is
- The force exerted on the web is the weight of the fly, so:
- The stretching of the web is
So if we solve eq.(1) for k, we find the spring constant:
Answer:
1.869 hours
Explanation:
= Time period = 11.1 h
Angular frequency is given by
The distance moved from highest to lowest level is given by
At the ocean surface
= Phase constant = 0 as clock is started at
The time taken for the water to fall the distance is 1.869 hours