The equation for kinetic energy is
E = 1/2 m v^2
Isolating for the speed gives us
v = sqrt(2E/m),
that is the square root of 2 times the energy divided by the mass.
This gives us a speed of
v = 8.5 m/s
So the answer is C.
The power transferred by the motor is equal to the product between the current and the voltage:
However, the power used by the winch system is less than this value. In fact, the work done is equal to the weight of the load times the distance through which it has been lifted:
And the power used by the system is the work done divided by the time taken:
Therefore, the efficiency of the system is given by the ratio between the useful power and the power in input:
2.4s
Explanation:
Given parameters:
Impulse = 12Ns
Force = 5N
Unknown:
Time taken for the force to act = ?
Solution:
Impulse is the change in momentum of a body when an external force acts on body for a period of time.
Impulse = force x time
Since the unknown in this problem is time, we make it the subject of the formula;
Time =
Inputting the parameters;
Time taken for force to act = = 2.4s
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Answer: TRUE
Explanation:Jump starting a car is a process of starting a car whose battery is Dead,which means it doesn't have enough battery life to start a Car.
The process involves bringing both cars close to each other and Connecting the positive side of a good battery to the positive side of the Dead battery using a JUMPER CABLES,
Connect the positive cable to the positive side of the working battery,
Connect the Negative cable to the Negative side of the working battery,
Finally,connect the Negative cable to a grounded meta part of the car we want to JUMP START.
Answer:
time is 0.5660 s
and time is - 3.62431 s
Explanation:
velocity u = 15 m/s
height s = 10 m
acceleration due to gravity g = –9.8 m/s²
to find out
time
solution
we will apply here distance equation that is
s = ut - 1/2× gt² ...........1
here put all these value and get time t
here s is height and g is -9.8
so
s = ut - 1/2× gt²
10 = 15t - 1/2× (-9.8)t²
10 = 15t + 4.9t²
solve it we get t
t = 0.56630 and -3.62431
so time is 0.5660 s
and time is - 3.62431 s