Answer:
The instantaneous velocity at any time during the second hour of the trip is 60 mph east
(C) is correct option
Explanation:
Given that,
Distance in first hour = 25 miles
Distance in second on hour = 60 miles
Instantaneous velocity :
Instantaneous velocity is equal to the distance divided by the time
We need to calculate the instantaneous velocity at any time during the second hour of the trip
Using formula of instantaneous velocity
.
Where, d = distance
t = time
Put the value into the formula
The direction of the instantaneous velocity is in east .
Hence, The instantaneous velocity at any time during the second hour of the trip is 60 mph east
Answer:
B = 32.17 x 10^-8 Tesla
u = 8.24 x 10^-8 J/m^3
P/A = 24.72 W/m^2
Explanation:
E = 96.5 V/m
velocity of light, c = 3 x 10^8 m/s
Let B be the magnetic field.
The relation between the electric field strength and the magnetic field strength is given by
B = E / c = 96.5 / (3 x 10^8) = 32.17 x 10^-8 Tesla
Let u be the energy density.
u = 8.24 x 10^-8 J/m^3
Let Power flow per unit area is
P/A = u x c = 8.24 x 10^-8 x 3 x 10^8 = 24.72 W/m^2
Answer:
(A). The rotational momentum of the flywheel is 12.96 kg m²/s.
(B). The rotational speed of sphere is 400 rad/s.
Explanation:
Given that,
Mass of disk = 10 kg
Radius = 9.0 cm
Rotational speed = 320 m/s
(A). We need to calculate the rotational momentum of the flywheel.
Using formula of momentum
Put the value into the formula
(B). Rotation momentum of sphere is same rotational momentum of the flywheel
We need to calculate the magnitude of the rotational speed of sphere
Using formula of rotational momentum
Put the value into the formula
Hence, (A). The rotational momentum of the flywheel is 12.96 kg m²/s.
(B). The rotational speed of sphere is 400 rad/s.