Answer:
At what time of day would you expect the New Moon to rise?
A) Midnight
B) Sunset
C) Noon
D) Sunrise
An HR diagram is a plot of:
A) Luminosity versus apparent magnitude.
B) Absolute magnitude versus luminosity.
C) Absolute magnitude versus surface temperature.
D)Apparent magnitude versus color index.
E) Color index versus surface temperature.
What is the most easily visible manifestation of the Earth's magnetic field?
A) The Van Allen radiation belts
B) The magnetopause
C) The aurorae
D) There is no easily visible manifestation of the Earth's magnetic field.
For a lunar eclipse (the moon is obscured from view), which phase is necessary?
A) third quarter
B) new moon
C) first quarter
D) full moon
Answer:
By throwing wrenches and screwdrivers away the side of spaceship he might be able to get back.
Explanation:
<em>Theory</em>
<u>The law of conservation of linear momentum</u>
The sum of linear momentum of a closed system under no external unbalance force remains the same.
Here consider the astronaut and the wrenches and screwdrivers as a system.
System in the empty space so no external unbalance force exerted on the astronaut. As the linear momentum is conserved when he throw wrenches and screwdrivers away form the space ship he will gain an equal momentum in the opposite direction. So he gains a certain velocity which he can use to drift towards the spaceship.
Answer:
a=7.384 m/s^2
Explanation:
let T be the tension in the string, m= mass
and a= acceleration
from the FBD in the attachment we can write
Tcos37°= mg
Tsin37° =ma
dividing both the equations we get
tan37° =a/g
therefore a=g×tan37°
a= 9.81×0.7535 = 7.384 m/s^2
the magnitude of the acceleration a of the train = 7.384 m/s^2