1. <span>A ball sitting at the top of a hill
</span>2. <span>A girl running in a race
</span>3. <span>Potential energy
</span>4. <span>Heat is due to the motion of molecules
</span>5. <span>Hot
</span>6. <span>Temperature
</span>7. H<span>eat moves through conduction, convection, and radiation
</span>8. <span>Fluids (liquids or gases)
</span>9. <span>An insulator slows heat transfer</span>
The answer is A.
When a substance is a gas, it fills its container no matter how many particles it's made of, however the number of particles present will directly affect the pressure and temperature of the system.
Answer:c
Explanation:
Given
Object moving towards the motion detector at a constant speed
Constant speed indicates that there is no acceleration .
As the object is moving in a straight line therefore its velocity is same and do not changes with time
thus the correct option is c i.e. a straight line with zero slope.
Answer:
Part a)
Frequency of sound is 130 Hz
Part b)
Wavelength of the sound is 2.65 m
Explanation:
Part a)
Frequency of source of the sound is same as the frequency of the sound
Here we know that motion of hammer is back and fourth with frequency
f = 130 cycles per second
so frequency of sound is same as frequency of hammer motion
so we have
Part b)
As we know that the speed of sound is
v = 345 m/s
We know that the frequency of sound is
f = 130 Hz
now the wavelength is given as
Should be 28 meters per second.
140m ÷ 5s