Answer:
0.435 N
The centripetal force increases by a factor of 4
Explanation:
Let the centripetal force be F
F =mv^2/r
m= mass of the object
v = linear velocity of the object
r = radius of the circular path
but v = 2πr/T = 2 * 3.142 * 0.147 / 0.388
v = 2.38 m/s
F = 0.0113 * (2.38)^2/0.147
F= 0.435 N
if v= 2v
Then;
F = m(2v)^2/r
F = m4v^2/r
F= 4mv^2/r
The centripetal force increases by a factor of 4
Answer:
Explanation:
Distance to Andromeda galaxy
Speed of light is
Time is given by
Hence, the light from Andromeda left ago
Answer:
The correct option is A
Explanation:
Buoyancy can be described as the upward force that causes an object to float on water. <u>When the buoyant force of a liquid is greater than the weight of an object, the object will move to the surface of the liquid and float (because the buoyant force would be able to push it upwards)</u>. If the buoyant force is lesser than the weight of the object, the object will sink (because the buoyant force would not be able to push the object upwards). And when the buoyant force and weight of an object cancel out, the object would be suspended at the depth that this occurs.
Thus, from the explanation above, it can be deduced that for an object to float, buoyant force must be greater than weight of the object. Thus, the correct option is A.
Answer:
<em>The equivalent resistance of the combination is R/100</em>
Explanation:
<u>Parallel Connection of Resistances</u>
If resistances R1, R2, R3,...., Rn are connected in parallel, the equivalent resistance is calculated as follows:
The electric resistance of a wire is directly proportional to its length. If a wire of resistance R is cut into 10 equal parts, then each part has a resistance of R/10.
It's known the 10 parts or resistance R/10 were connected in parallel, thus the electric resistance is:
Note the sum consists of 10 equal terms. Operating on each term:
The sum of 10 identical fractions yields 10 times each fraction:
Solving for Re needs to take the reciprocal of both sides of the equation:
The equivalent resistance of the combination is R/100
Answer:
period = 0.833 s
frequency=1.2 Hz
Explanation:
The period is the duration of time taken for a 1 heartbeat
Frequency is the number of heartbeats per second