7200 joules of heat and light energy was dissipated into the air. But no work was done ... no force moved through no distance.
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f' = frequency observed by the police car after sound reflected from the vehicle and comes back to police car = 1250 Hz
f = frequency emitted by the police car = 1200 Hz
V = speed of sound = 340 m/s
v = speed of vehicle = ?
frequency observed by the police car is given as
f' = f (V + v)/(V - v)
inserting the values in the above equation
1250 = 1200 (340 + v)/(340 - v)
v = 6.9 m/s
Answer:
pumpkin
Explanation:
watermelon and pumpkins are close to shape and size
In this case to find the weight of an object you must use the formula.
W = mg
