Answer:
9 seconds
Explanation:
cross multiplying
it will take 9secs for the car to go from 0 to 45 km/ h
Answer:
F = ma
Explanation:
If mass = m
Acceleration = a
Force = F
Force can be calculated by the product of mass and acceleration.
That is F = ma
This equation is gotten from newton's second law of motion which states that the rate of change of momentum of a body is proportional to the applied force which takes place in the direction of force applied
I hope this was helpful, Please mark as brainliest
Answer:
-4.33m/s
Explanation:
Using the law of conservation of momentum
m1u1+m2u2 = (m1+m2)v
m1 and m2 are the masses
u1 and u2 are their respective velocities
v is the final velocity
From the question;
m1 = 4000kg
m2 = 6000kg
u1 = 4m/s
u2 = ?
v =-1m/s
Substitute into the formula and get u2
4000(4)+6000u2 = (4000+6000)(-1)
16000 + 6000u2 = -10000
6000u2 = -10000-16000
6000u2 = -26000
6u2 = -26
u2 = -26/6
u2 = -13/3
u2 = -4.33m/s
Hence the velocity of the truck is -4.33m/s
Answer:
Explanation:
The electric field outside the sphere is given as,
E = k Q /r²
here Q = n x 1.6 x 10⁻¹⁹ C
where n is the number of electons
if the dimeter of sphere d= 25 cm= 0.25 m
then the radius r = 0.125 m
we get
n= E r²/ k x 1.6 x 10⁻¹⁹ C
n = 1350N/C x (0.125m)² / (8.99 x 10⁹ N m²/C² x 1.6 x 10⁻¹⁹ C)
n = 14664731646
The reason behind this is, in nuclear reactions number of protons and neutrons are changed which is impossible in case of normal chemical reactions. Hope this helps.