5.00 g of molten NaCl is at its melting temperature. The salt is added to 25.00 mL water at 25.0 °C in a coffee cup calorimeter.
1 answer:
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Answer:
750W
Explanation:
Given parameters:
Weight = 1 x 10³N = 1000N
Distance = 1.5m
Time = 2s
Unknown:
Power = ?
Solution:
Power is the rate at which work is done
Work is the force applied on a body to move it through a particular distance
Work = force x distance
Power =
Now, work = 1000 x 1.5 = 1500J
So;
Power = = 750W
Answer:
a)
b)
Explanation:
Given:
Frequency of the whistle, f = 564 Hz
Radius of the circle, r = 71.2 cm = 0.712 m
Angular speed, ω = 17.1 rad/s
speed of source, = rω = 0.712 × 17.1 = 12.1752 m/s
speed of sound, v = 343 m/s
Now, applying the Doppler's effect formula, we have
where,
= relative speed of the detector with respect to medium = 0
a) for lowest frequency, we have the formula as:
on substituting the values, we get
or
b) for maximum frequency, we have the formula as:
on substituting the values, we get
or