Answer:
The scientist will be looking for the velocity of the wave in air which is equivalent to 10^7m/s
Explanation:
If an object in space is giving off a frequency of 10^13Hz and wavelength of 10^-6m then the scientist will be looking for the velocity of the object in air.
The relationship between the frequency (f) of a wave, the wavelength (¶) and the velocity of the wave in air(v) is expressed as;
v = f¶
Given f = 10^13Hz and ¶ = 10^-6m,
v = 10¹³ × 10^-6
v = 10^7 m/s
The value of the velocity of the object in space that the scientist will be looking for is 10^7m/s
Question:
Which best compares simple machines with compound machines?
(A)Both make work easier, but compound machines consist of two or more simple machines.
(B)Both make work easier, but compound machines have less mechanical advantage than simple machines.
(C)Both can reduce the force needed to do work, but simple machines are more common in everyday machines.
(D) Both always increase the force needed to do work, but compound machines are more common in everyday machines.
Answer:
"Both of them makes work easier, perhaps the compound machine consists of two or more simple machines" compares the simple machine with the compound machine in best way.
Explanation:
Simple machine are mechanical devices like lever, pulley , wedge etc.,that is used to apply force. Any machine made using the simple machines or the machines that comprises of 2 or more simple machines is referred as compound machine.
An example of compound machine is wheelbarrow which is built up of a lever and axle and a wheel . As the 'compound machine' is consist of 2 or more simple machine, its has higher efficiency when compared to simple machines. If each of the six simple machine have higher distance force, compound machine can have higher force as it multiplies the efficiency of all the simple machines working all together.
Answer:
Answer is D.window units / small residential units
Refer below.
Explanation:
Rotary compressors are used primarily in window units / small residential units
Answer:
The object fell from about 38.14 meters
Explanation:
We can use the formula for displacement under accelerated motion due to gravity to find the velocity of the object had 30 m before hitting the ground :
Now, knowing this velocity, we can find the time it took to fall from the initial position to 30 m before hitting the ground:
And now we can find what is the total distance covered in 1.5 s plus 1.29 seconds for this free falling object: