Answer: Sound waves are a waves of compression and rarefaction, by which sound is propagated in an elastic medium such as air.
Explanation:
In physics, sound is a vibration that propagates as an acoustic wave, through a transmission medium such as a gas, liquid or solid.
Answer:
1.44 m/s²
Explanation:
t = Time taken
u = Initial velocity
v = Final velocity
s = Displacement
a = Acceleration
This velocity will be the initial velocity of the car when it passes through the first building
The acceleration of the car is 1.44 m/s²
Answer:
The following statements are true
B) The resistance of a conductor is proportional to the resistivity of the material of which the conductor is composed.
C) A material that obeys Ohm's law reasonably well is called an ohmic conductor or a linear conductor.
D) Good conductors of electricity have larger conductivity values than insulators.
Explanation:
Answer:
The efficiency of the machine is 40 %.
Explanation:
We have,
Output work by the machine is 4 joules and the input work is 10 joules.
It is required to find the efficiency of a machine. The efficiency of a machine is given by the ratio of output work to the input work. It is given as :
So, the efficiency of the machine is 40 %.
Acceleration, speed where the speed changes over time, in both direction and speed, and simple time definition to modify, or the timeframe to alter, and the further calculation can be defined as follows:
Given:
To find:
Calculate time that will take by marble to bottom of the ramp.
Solution:
Using formula:
By the first formula we calculate the acceleration:
After calculating the acceleration putting value into the second formula and calculate the time:
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