Helioseismology shows that deeper layers of gas in the Sun rotate at different speeds. When different parts of an object rotate at different rates it is called
a. the dynamo effect.
b. lagging.
c. reconnection.
d. differential rotation.
e. the Zeeman effect.
d
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Iron nuclei are the most tightly bound nuclei, which is why their production leads to type II supernovae
Indicate whether the statement is true or false
There is no current in the circuit shown in the figure below until the switch is closed. The current through the 20-? resistor the instant after the switch is closed is either [1] 15 A or [2] 5.0 A, and the current through the 20-? resistor after the switch has been closed a long time is either [3] 5.0 A or [4] 15 A. Which combination of the above choices is correct?
a.
[1] and [3]
b.
[1] and [4]
c.
[2] and [3]
d.
[2] and [4]
e.
None of these
Why is MASS considered a more basic property than WEIGHT?
What will be an ideal response?
A 1.5-kg object has a velocity of 
m/s at t = 0. It is accelerated at a constant rate for five seconds after which it has a velocity of 
m/s. What is the magnitude of the resultant force acting on the object during this time interval?
A. 3.8 N B. 3.2 N C. 2.8 N D. 4.3 N E. 4.6 N