density = mass / volume.
277/38 approx 280/40 approx 7
tin or zinc. use calculator
Answer:
v = -5 m/s
Explanation:
It is given that,
The initial velocity of the ball, u = 25 m/s
We need to find its velocity after 2 seconds in the air.
Let v is the velocity of the ball after 2 seconds. Using equation of motion to find it.
v = u + at
Here, a = -g
v = u -gt
Putting all the values,
v = 25 - (10)(3)
= 25-30
= -5 m/s
So, the velocity of the ball after 3 seconds is 5 m/s and it is in downward direction.
The force exerted by the rope is 132 N.
<u>Explanation:</u>
It is known that the external force applied on any object is directly proportionate to the products of mass of the object and the acceleration attained by the object. So, here, the object is a barrel of mass 12 kg. It is given that barrel is pulled by a rope. So tension force will be acting on the rope during pulling the barrel.
As the barrel is being pulled up with an acceleration of , the force required to attain this acceleration is the net force on the barrel. But there is gravitational force which will also be acting on the barrel in opposing direction to the tension force of the rope.
Thus the net force experienced by the barrel is difference between the tensional force exerted by the rope on the barrel in upward direction and the gravitational force on the barrel in downward direction.
As,
Similarly,
Thus, force exerted by the rope=14.4 N + 117.6 N = 132 N
Answer:
B. has the greatest mass
Explanation:
mass & distance affect pull
grativy affects speed & shape of orbit of the planet
quiziz
Answer:
40000N
Explanation:
Given parameters:
Mass of the car = 1000kg
Velocity of the car = 20m/s
Time taken = 0.5s
Unknown:
Force on the car = ?
Solution:
According to Newtons second law of motion:
F = m a
F is the force
m is the mass
a is the acceleration
F = m
Change in velocity = 0 - 20 = -20m/s
F = 1000 x = -40000N
The force on the car is 40000N