Answer:
A) 2
Explanation:
Given;
magnetic field of the coil, B = 1.6 T
frequency of the coil, f = 75 Hz
maximum emf developed in the coil, E = 56.9 V
area of the coil, A = 0.15 m x 0.25 m = 0.0375 m²
The maximum emf in the coil is given by;
E = NBAω
Where;
N is the number of turns
ω is the angular velocity = 2πf = 2 x 3.142 x 75 = 471.3 rad/s
N = E / BAω
N = 56.9 / (1.6 x 0.0375 x 471.3)
N = 2 turns
Therefore, the value of N is 2
A) 2
Answer:
Acceleration (a) is the change in velocity (Δv) over the change in time (Δt), represented by the equation a = Δv/Δt. This allows you to measure how fast velocity changes in meters per second squared (m/s^2).
Explanation:
Acceleration can be calculated by dividing the change in velocity (measured in metres per second) by the time taken for the change (in seconds). The units of acceleration are m/s/s or m/s 2.
Answer: v2 = -50.8m/s
Therefore, the speed of the baseball is 50.8m/s away from the bat. (Reverse direction)
Explanation:
Using the law of conservation of momentum:
The impulse of the bat = change in momentum of the baseball
Ft = ∆M
Ft = m1v1 - m2v2
Since m1 = m2 = m (the mass remains unchanged)
Ft = m(v1 - v2) .....1
Given:
Force F = 8900N
Mass m = 0.145kg
time t = 1.3 × 10^-3 s
Initial velocity v1 = 29m/s
Substituting into eqn 1
8900(1.3×10^-3) = 0.145(29-v2)
29-v2 = 79.79
v2 = 29 - 79.79 = -50.8m/s
v2 = -50.8m/s
Therefore, the speed of the baseball is 50.8m/s away from the bat.
PART a)
Force of friction on the box is given by formula
now the component of weight along the inclined
now by force balance the force required to hold the block
Part b)
to slide the block upwards the friction force will be upwards along the plane
Part c)
Kinetic friction on the block is given by
now in order to move it up
Part d)
now to accelerate upwards by 0.65 m/s^2 we can use
Answer: The air entering on top of the wing speeds up. The air entering high pressure area on bottom slows down. That is why air on top moves faster.
Explanation: