I need help on that one 2 someone please help
Answer:
3503.72 seconds
819.96 seconds
Explanation:
=Velocity of river = 0.566 m/s
=Velocity of student = 1.17 m/s
Distance to travel = 1.57 km = 1570 m
So,
Time = Distance / Speed

Time taken by the student to complete the trip is 3503.72 seconds
In still water

The difference in time between moving water and still water is 3503.72-2683.76 = 819.96 seconds
Answer:

Explanation:
speed of bat = 6 m/s
sound wave frequency emitted by bat = 30.0 kHz
as we know,
speed of sound (c)= 343 m/s



now frequency received by bat is equal to



hence the frequency hear by bat will be 29.98 Hz
Answer:
D
Explanation:
The decrease in potential energy is equal to the increase in kinetic energy.
mgh
250 x 9.8 x 30
=73, 500