I think the answer is A
Hope it helps you
Answer:
The question implies that force of friction is 2.1E4 N
F = M v^2 / R frictional force needed to supply this centripetal force
2.1E4 = M v^2 / R
v^2 = R * 2.1E4 / M
v^2 = 120 * 2.1E4 / 2.5E3 = 1200 * 2.1 / 2.5 = 1008 m^2/s^2
v = 31.7 m/s max speed of truck (about 70 MPH)
Best way is to study, pay attention in class. Something i have found very helpful is take notes. Writing things down is a very good way to remember content.
Answer:
The magintude of the acceleration for both objects is
Explanation:
Drawing a free body diagram on the two boxes we can analyze the system more easily.
we can take the acceleration going up as positive for reference purposes.
for mA let's suppose that is ascending so:
and for mB (descending):
because the two boxes has the same acceleration because they are attached together:
So the magintude of the acceleration for both objects is
Answer:
Explanation:
current I = 14 x 10⁻³ A
distance of current d = 2.2 x 10⁻² m
Magnetic field B due to a long straight current carrying wire
B = (μ₀ /4π) x (2 I / d )
= 10⁻⁷ x 2 x 14 x 10⁻³ / 2.2 x 10⁻²
= 12.72 x 10⁻⁸ T .