Answer:
(a)
(b) It is moving at 14 m/s.
Explanation:
(a)
Given:
The energy, , of an object moving with a velocity is given as:
, where, is its mass.
Multiplying both sides by 2, we get
Now, divide both sides by
Taking square root both sides, we get
Therefore, in terms of and is given as:
(b)
Using the above formula,
Plug in 4900 joules for and 50 kg for . Solve for . This gives,
Therefore, it is moving with a speed of 14 m/s.
Complete question:
An ideal measuring device is one that does not alter the very measurement it is meant to take. Therefore, in comparison with the resistance being measured, the resistances of an ideal ammeter and an ideal voltmeter must be, respectively: Select the best answer from the choices provided.
a) very small; very small
b) very large; very small
c) very small; very large
d) very large; very large
Answer:
c) very small; very large
Explanation:
Ammeters can be said to be a device which measures the flow of electric current through a conductor. An ideal ammeter is said to have zero internal resistance. This is because there will be little or no voltage drop as electric current flows through it.
Therefore the resistance of an ideal ammeter must be very small.
A voltmeter can be said to be a device that measures the difference in potential difference between two points in a given circuit. The internal resistance of a voltmeter is said to be infinite, which means it could be very large. This means no current will flow through the voltmeter and the measured voltage will have little or no error.
Therefore the resistance of an ideal voltmeter must be very large.
Answer:
The average component velocity is 32.5 m/s
Explanation:
v = u +at bhjklj kj h
x = (u + v / 2 )t
Average velocity is given by
From the question,
Initial speed, u = 28 m/s
Final speed, v = 37 m/s
Time, t = 10 secs
From the formula
where is the displacement
Put the given values into the equation to find the displacement
Now, for the average component velocity
Hence, the average component velocity is 32.5 m/s
Answer: you can measure how hot something is in Celsius or Fahrenheit. The hotter something is, the more spaced out the molecules are.