the formula for momentum is velocity times mass
car :
1200 x 30 = 36000
truck:
2000 x 20 = 40000
Ans : truck has a greater momentum
Answer:
It stays the same.
Explanation:
Entropy of a system either increases or remains constant in any process, it never decreases.
The transfer of heat from the Sun is in the form of thermal radiation (also called infrared radiation)
The transfer of heat at the person’s feet is by thermal conduction. During the day the sand will be hot so if you step on it with bare feet there will be conduction of heat to the feet.
Answer:
The maximum speed is 23.39m/s
Explanation:
Centripetal force Fc is the force acting on a body moving in a circular path and directed towards the centre of the path.
If F = ma
centripetal acceleration a = v²/r
Centripetal force Fc = mv²/r ... (1)
where;
m is the mass of the object
r is the radius.
Since there is friction between the tyre and the road, then the frictional force Ff acts between the surface and this frictional force is the one that tends to oppose the moving force (centripetal force)
Ff = μsR where
μs is the coefficient of static friction
R is the normal reaction which is also equivalent to the weight of the car i.e R = W = mg
Ff = μsmg ... (2)
For the body to be static, the centripetal force must be equal to the frictional force i.e Fc = Ff
mv²/r = μsmg
Making v the subject of the formula;
v²/r = μsg
v² = μsgr
v = √μsgr
Given the following data;
μs = 0.6
g = 9.81m/s²
r = 93.0m
v = √0.6×9.81×93
v = √547.398
v = 23.39m/s
