Answer:
The Height of a pyramid is 4r.
Explanation:
Explanation is in the following attachments
B. +Q, + W are the correct sign
Answer:
Time period between the successive beats will be 0.1703 sec
Explanation:
We have given speed of the sound v = 349 m/sec
Wavelength of piano 
Wavelength of piano 
So frequency of piano A 
Frequency of piano B 
So beat frequency f = 455.61 - 449.74 = 5.87 Hz
So time period 
So time period between the successive beats will be 0.1703 sec
Answer:
the greater the height of an object the *greater* its gravitational potential energy
greater