What is heat transfer?
What will be an ideal response?
Heat transfer is rate at which heat or energy flows across a systems boundary.
Physics & Space Science
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A 150 W light bulb is operating on a 120 V rms ac line. What is the rms current in the bulb?
A. 2.50 A B. 1.67 A C. 1.50 A D. 1.25 A E. 0.883 A
Physics & Space Science
Copernicus was the first to propose that Earth moved around the sun
Indicate whether the statement is true or false
Physics & Space Science
The gravitational field at the earth due to the moon is (the mass of the moon is 
kg and separated by a distance of 
A. 
B. 
C. 
D. 
E. 
Physics & Space Science
The unstable isotope 234Th decays by ? emission with a half-life of 24.5 days
The initial decay rate of the sample was 9.9 × 1013 Bq. (1 u = 1.6605 x 10-27 kg) (a) What mass of 234Th was initially present? (b) What is the decay rate after 68 days?
Physics & Space Science