Author Question: Sputnik I was launched into orbit around Earth in 1957. It had a perigee (the closest approach to ... (Read 105 times)

Redwolflake15 · **on:** Jul 29, 2018

Sputnik I was launched into orbit around Earth in 1957. It had a perigee (the closest approach to Earth, measured from Earth's center) of 6.81 106 m and an apogee (the furthest point from Earth's center) of 7.53 106 m.

What was its speed when it was at its perigee? The mass of Earth is 5.97 1024 kg and G = 6.67 x 10-11 Nm2/kg2. A)

7.18 103 m/s
B)

7.84 103 m/s
C)

8.23 103 m/s
D)

11.0 103 m/s
E)

13.4 103 m/s

Question 2

An unknown resistor is wired in series with an ammeter, and a voltmeter is placed in parallel across both the resistor and the ammeter. This network is then placed across a battery.

If one computes the value of the resistance by dividing the voltmeter reading by the ammeter reading, the value obtained A)

is less than the true resistance.
B)

is greater than the true resistance.
C)

is the true resistance.
D)

could be any of the given answers. It depends on other factors.