They can travel through space
Answer:
h = 15.34 m
Explanation:
given,
tuning fork vibration = 513 Hz
speed of sound = 343 m/s
frequency after deflection = 489 Hz
the source (the fork) moves away from the observer, its speed increases and hence the apparent frequency decreases
u = 16.92 m/s
height of the building
v² = u² + 2 g s
16.92² = 2 x 9.8 x h
h = 14.61 m
time taken by sound to reach observer
in this time tuning fork has fallen one more now,
h' = 0.7296 m = 0.73 m
total distance
h = 14.61 + 0.73
h = 15.34 m
Our Sun is one of many stars in the Milky Way galaxy. Earth is closer to the Sun than any other star. This is evident because " we rely on the Sun's radiant energy on Earth".
<u>Option: B</u>
<u>Explanation:</u>
The Sun produces much radiant energy which is distributed as light to the Earth. Plants supports only process called photosynthesis for their food production, transform the electromagnetic energy in sunlight into chemical energy for their food. Radiant electromagnetic waves can be either visible or invisible.
Maximum solar radiation is absorbed by the atmosphere, but much of what hits the surface of the earth is emitted back into the atmosphere for heat energy to result. Dark colored items like asphalt consume radiant energy more easily than objects colored with light.
Permanent magnet. An induced magnet would be created when a piece of iron (for example) is in contact with a magnet. Temporary magnets would be something like an electromagnet. Bar magnets are permanently magnetic unless we heat them or hammer them to cause their domains to loose alignment.
Answer:
F = 1400 N
Explanation:
It is given that,
Mass of the ball, m = 70 kg
It is moving with an acceleration of 20 m/s². We need to find the force exerted by the ball.
Force is given by the product of mass and acceleration. So,
F = ma
So, the force of 1400 N is exerted by a metal ball.
