On a drive from one city to? another, victor averaged 39 mph. if he had been able to average 72 ?mph, he would have reached his
1 answer:
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Answer: 2.92 s
Explanation:
Given
Mass of ball is
The initial velocity of the ball is
Velocity after the rebound is
Force during the contact is
We know, change in momentum is Impulse
Thus, the force is applied for 2.92 s
Answer:
The magnitude of the electric force on a protein with this charge is
Explanation:
Given that,
Electric field = 1500 N/C
Charge = 30 e
We need to calculate the magnitude of the electric force on a protein with this charge
Using formula of electrostatic force
Where, F = force
E = electric field
q = charge
Put the value into the formula
Hence, The magnitude of the electric force on a protein with this charge is
The complete sentence is:
A calorimeter directly measures changes in temperature in order to calculate specific heat.
In fact, the amount of energy acquired/released by a substance is directly proportional to its change in temperature due to the equation
where Q is the amount of energy, m is the mass of the substance, Cs is the specific heat of the substance and is the change in temperature. Therefore, by knowing Q, m and by measuring the change in temperature, it is possible to calculate Cs, the specific heat capacity of the substance.