Answer: Option C
C) accelerated vertical motion and constant horizontal motion.
Explanation:
If there is no air resistance then during the projectile movement the only force that causes an acceleration is the gravitational force.
We know that this force produces an acceleration of 9.8 m / s ^ 2 in the projectile.
As the gravitational force attracts the object towards the earth, then the acceleration that this force produces is always in the vertical direction. In the horizontal direction the object is not accelerated (because there is no air resistance).
Therefore the correct answer is option C.
"accelerated vertical motion and constant horizontal motion".
The rate of doing work is called POWER.
Power is also defined as the rate of transfer of energy. It measures the speed of how work is done.
The unit of power is WATT.
Power is computed by dividing WORK DONE by TIME TAKEN.
P = W/t
1 watt:
*power of a machine
*power of an agent that does work at the rate of 1 joule per secon
1000 watt = 1 kilowatt
1000 kilowatt = 1 megawatt
The first runner because it is very clear that accelarition depends on the time and we know that the time in this case is pretty simple
Answer:
Explanation:
given,
speed of wind, = 14 m/s
frequency of horn,f_s = 1000 Hz
speed of sound,V = 344 m/s
frequency heard by the listener
using Doppler effect
f_L is the frequency of the sound heard by the listener
f_s is the frequency of sound emitted by the listener
V is the speed of sound
v_L is the speed of listener
v_s is the speed of source
now,
considering the frame of reference in which wind is at rest now, both listener and the source will be moving at 14 m/s
now on solving we will get
hence, the frequency heard by the listener is equal to 1000 Hz
