I'm assuming we're applying the standard Integral form of the calculation of work. The solution is provided in the image.
Answer:
c
Explanation:
When a satellite is orbiting the earth , a constant force is being applied on it which means it must has acceleration. Also the direction of satellite is always being changed when it is orbitting to there is always change in the velocity vector which means acceleration.
You can view in the attached diagram to understand how the velocity is being changed.
I., II., and IV. are examples of acceleration. III. isn't.
Answer:
Explanation:
Given
velocity of driver
=25 m/s w.r.t ground towards north
driver observes that rain is making an angle of
with vertical
While returning
=25 m/s w.r.t. ground towards south
suppose
=velocity of rain drop relative car while car is going towards north
=velocity of rain drop relative car while car is going towards south
z=vector sum of 
Now from graph



therefore magnitude of z is given by






Thus rain drops make an angle of
w.r.t to ground
Answer:
3m
Explanation:
89.1 MHz means
89.1×10^6 cycles/second.
Electromagnetic radiation (including radio waves) travel at
3.0×10^8meters/second
Wavelength = Speed/Frequency
The wavelength of a
89.1MHz radio signal is
3.0×10^8/89.1x10^6
= 0.03x10^2
= 3meters