Yes, it do, for a short time.
Answer: Option B) 1038J
Explanation:
Given that
Mass of person (m) = 83kg
kinetic energy (KE) = ?
Speed of elevator (v) = 5m/s
Kinetic energy is the energy possessed by a moving object. It is measured in joules, and depends on the mass (m) of the object and the speed (v) by which it moves
i.e K.E = 1/2mv²
KE = 1/2 x 83kg x (5m/s)²
KE = 0.5 x 83 x 25
KE = 1037.5J (Round the kinetic energy to the nearest whole number as 1038J)
Thus, the kinetic energy of the person is 1038 Joules
No, it is not possible for thermal energy to be equal in both bowls.
Answer:
94.13 ft/s
Explanation:
<u>Given:</u>
- = time interval in which the rock hits the opponent = 10 s - 5 s = 5 s
- = distance to be moved by the rock long the horizontal = 98 yards
- = displacement to be moved by the rock during the time of flight along the vertical = 0 yard
<u>Assume:</u>
- = magnitude of initial velocity of the rock
- = angle of the initial velocity with the horizontal.
For the motion of the rock along the vertical during the time of flight, the rock has a constant acceleration in the vertically downward direction.
Now the rock has zero acceleration along the horizontal. This means it has a constant velocity along the horizontal during the time of flight.
On dividing equation (1) by (2), we have
Now, putting this value in equation (2), we have
Hence, the initial velocity of the rock must a magnitude of 94.13 ft/s to hit the opponent exactly at 98 yards.
Answer:
6844.5 m/s.
Explanation:
To get the speed of the satellite, the centripetal force on it must be enough to change its direction. This therefore means that the centripetal force must be equal to the gravitational force.
Formula for centripetal force is;
F_c = mv²/r
Formula for gravitational force is:
F_g = GmM/r²
Thus;
mv²/r = GmM/r²
m is the mass of the satellite and M is mass of the earth.
Making v the subject, we have;
v = √(GM/r)
We are given;
G = 6.67 × 10^(-11) m/kg²
M = 5.97 × 10^(24) kg
r = 8500 km = 8500000
Thus;
v = √((6.67 × 10^(-11) × (5.97 × 10^(24)) /8500000) = 6844.5 m/s.