a woman is swimming across a cold lake. her body temperature is 98 degrees fahrenheit , and the lake water is at 60 degrees fahr
1 answer:
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Answer:
Their speed immediately after the collision is 60 km/h
Explanation:
The magnitude that characterizes the state of motion of a body is called the quantity of motion. The momentum of a particle of mass m moving with velocity v is defined as the product of mass and velocity:
p=m*v
Newton's second law states that to accelerate an object you must apply a force to it. In other words, to change the moment of an object, an impulse must be applied to it, an impulse that is produced by a force. In both cases there is an external agent that exerts the force or the impulse, the internal forces are not considered. When the force net is zero, so the net momentum is zero, and therefore there is no change in total momentum. Then it can be stated that if a net force is not exerted on a system, the total moment of the system cannot change.
In summary, the principle of conservation of linear momentum, also known as the principle of conservation of momentum, states that if the resultant of the forces acting on a body or system is zero, its momentum remains constant in time.
Then before collision, the momentum of truck is 1,500 kg*80 km/h = 120,000 kg.km/h and the momentum of car is 1,000 kg* 30 km/h = 30,000 kg.km/h
So, the total momentum before collision is 120,000 kg*km/h+ 30,000 kg*km/h = 150,000 kg.km/h
The two cars stick together after the collision. This means that the speed V of both is the same. Therefore, the momentum after collision is
V*(1,500 kg + 1,000 kg) = V*2,500 kg
Applying the law of conservation of momentum, that it states that the total momentum of two objects before collision is equal to the total momentum of the two objects after collision., you get:
150,000 kg.km/h= V*2,500 kg
Solving:
V= 60 km/h
<u><em>Their speed immediately after the collision is 60 km/h</em></u>
Answer:
1) Measuring cylinder
2) Top Pan Balance
Explanation:
To find the density of the pebble Nabil should first accurately measure the mass of the pebble using the top pan balance
He should then fill the displacement can till the water reaches the outlet pipe at the to of the cylinder
He should then place the pebble into the cylinder carefully ans allow the water that would start coming out to stop
The volume of water in the displaced cylinder is then measured and the density is found by dividing the mass of the pebble by the volume of water in the measuring cylinder
Answer:
25 ohms
Explanation:
Hi there!
Ohm's law states that where V is voltage, I is current and R is resistance.
Plug the given information into Ohm's law (V=50, I=2) and solve for R
Divide both sides by 2 to isolate R
Therefore, there are 25 ohms of resistance present in this circuit.
I hope this helps!