Answer:
(B) 200 Hz
Explanation:
To find the apparent frequency you use the Doppler effect for a receding source:
f: frequency of the source = 300Hz
v: speed of souns = 340m/s
v_s: speed of the source = v/2 = 170m/s
you replace the values of the parameters and obtain:
hence, the apparent frequency is 200Hz
(B) 200 Hz
Earth's gravity and the satellite's velocity keeps it so that it stays in orbit. (there is a more complicated side, too...)
Answer:
We can reasonably improve a machines ability to do work by reducing the friction between the moving parts of machine.
Explanation:
According to the law of conservation of energy, the energy can neither be created nor destroyed.
Answer:
Assuming a constant force, if the mass of object increases, the acceleration will decrease and if mass of a object decreases, the acceleration will increase. Also if the force applied to object increases the acceleration will also increase whereas if the force applied decreases, the acceleration will also decrease.
Explanation:
We know that according to newton's second law of motion,
F = ma, where F is force applied, m is mass of an object and a is measure of body accelerated with the applies force.
a = F/m
Assuming force is constant, we get
a α 1/m, that is acceleration is inversely proportional to mass. Hence if mass of an object decreases the acceleration of object will increases and vice versa.
Also from equation, F = ma, we infer that F α a . That is the force applied is directly proportional to amount the body is accelerated. . Hence if force applied increases then the acceleration will also increase and vice versa
Answer:
the moment of inertia of the wheel is is 6.245 kg.m²
Explanation:
Given;
applied force, f = 22.04 N
radius of the wheel, r = 0.34 m
angular acceleration, a = 1.2 rad/s²
The moment of inertia of the wheel is calculated as;
Therefore, the moment of inertia of the wheel is is 6.245 kg.m²