Answer:
1.24 J
Explanation:
The work done by a force is given by
where
F is the magnitude of the force
d is the displacement
is the angle between the directions of F and d
In this problem,
F = 0.18 N is the average force exerted by the muscles
d = 6.9 m is the displacement
(we assume the direction of the force is parallel to the displacement)
Substituting,
The angular diameter can be
calculated by using the formula,
Angular diameter = 57.3 x
physical diameter / distance.
The physical diameter of the
sun = 1.4 x 10^6 km.
The minimum distance of Mars
from Sun = 205 x 10^6 km
The minimum angular diameter of
the Sun as seen from Mars is:
Angular diameter = 57.3 x
physical diameter / distance = 57.3 x (1.4 x 10^6 km / 205 x 10^6 km) = 0.39
degrees.
The maximum distance of Mars
from Sun = 249 x 10^6 km.
The maximum angular diameter
of Sun as seen from Mars is,
Angular diameter = 57.3 x physical
diameter / distance = 57.3 x (1.4 x 10^6 km / 249 x 10^6 km) = 0.32 degrees
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Answer:
positive, positive
You throw a rock upward. The rock is moving upward, but it is slowing down. If we define the ground as the origin, the position of the rock is positive and the velocity of the rock is positive
Explanation:
Given that the ground is defined as the origin.
The position of the rock is positive since the rock is thrown upward, the position also increases with time until it reaches the maximum height. Also, since the rock is thrown upward with the ground as the origin, the velocity of the rock is positive but the velocity reduces with time (change in height per unit time as the rock moves up is positive)