Answer:
v = 7671.57 m/s
T = 1.55 hours
Explanation:
mass of Earth, M = 6 x 10^24 kg
Radius of earth, R = 6400 km = 6.4 x 10^6 m
height, h = 400 km
Velocity is given by

where, G be the universal gravitational constant.
G = 6.657 x 10^-11 Nm^2/kg^2

v = 7671.57 m/s
Let T b the period


T = 5566.53 second
T = 1.55 hours
Answer:

Explanation:
Since the package remains in contact with the car's seat, the package's speed is equal to the car's speed. At the top on the mountain the package's centripetal force must be equal to its weight:

The centripetal force is defined as:

Here v is the linear speed of the object and r is the radius of curvature. We need to convert the linear speed to
:

Now, we calculate r:

Answer:
atoms cannot go bad
Explanation:
Because they stay alive and get good nutriants
When the force on some area is doubled and the area doesn't change,
then the pressure on that area has doubled.