Answer:
Explanation:
Acceleration is defined as the variation of velocity with time :
Where:
Finally:
Answer:
4.28 s
Explanation:
after two seconds (2 s) His friends is
d = 3.5 m/s x 2 s = 7 meter ahead.
in this state, a bicylist start from initial velocity vo = 0 m/s and accelerat 2.4 m/s²
then, when bicylist reach his friend
t friend = t bicyclist = t
d bicylist = d friend + d
-------
d friend = 3.5 . t
d bicylist = vo . t + ½ a t²
d friend + d = vo . t + ½ a t²
3.5 t + 7 = 0 . t + ½ . 2.4 . t²
3.5 t + 7 = 1.2 t²
0 = 1.2 t² - 3.5 t - 7
t = -1.363 and t = 4.28
take the positive one
Answer: 1224 joules
Explanation:
Given variables are:
Power (p) = 68 W
Time taken (t) = 18 seconds
work done (w) = ?
Recall that power is the rate of work done per unit time i.e Power is obtained by dividing the work done by the time taken.
Hence, Power = work / time
Make work the subject formula
work = power x time
work = 68 watts x 18 seconds
work = 1224 joules
Thus, 1224 joules of work is done.
Answer:
The net gravitational force exerted by these objects is
Explanation:
Given that,
Mass of another object m = 33.0 kg
Mass M₁ = 160 kg
Mass M₂ = 460 kg
Distance = 3.40 m
We need to calculate the net gravitational force
Using formula,
Where, G = gravitational constant
m = mass of another object
= mass of first object
= mass of second object
r = distance
Put the value into the formula
Hence, The net gravitational force exerted by these objects is