A ball is projected horizontally from top of a cliff. The time to hit ground depends on
A. Both velocity and height
B. Height of cliff and g
C. Mass of ball
D. Horizontal velocity
Answer: Option B
Solution (By JKSSB Mock Tests)
Vertical motion is independent of horizontal. t = √(2h/g). Mass doesn't affect. Horizontal velocity affects range, not time of fall. Projectile motion independence of perpendicular components.
Explanation:
The Doppler Effect is the apparent change in the frequency (and thus pitch) of a wave due to the relative motion between the source and the observer. As the ambulance approaches, sound waves get compressed, increasing the perceived frequency (higher pitch). As it moves away, waves stretch, lowering the frequency.
Explanation:
Fundamental units: kg, m, s, A, K, mol, cd. Newton is derived (kg m/s²). Therefore, Newton is not fundamental. Remember the seven base units.
No comments yet. Be the first to start the discussion!