Answer:
3- kinetic energy was transferred from the water to the ice
Explanation:
the kinetic energy in this situation is the molecules vibrating so the molecules in the ice absorb it and make the molecules not vibrate so it gets colder
Answer:
The radius r of the metal sphere.
Explanation:
From Gauss's law we know that for a spherical charge distribution with charge
, the electrical field at distance
from the center of the sphere is given by
What is important to notice here is that the radius of the sphere does not matter because any test charge sitting at distance
feels the force as if all the charge
were sitting at the center of the sphere.
This situation is analogous to the gravitational field. When calculating gravitational force due to a body like the sun or the earth, we take not of only the mass of the sun and the distance from it's center; the sun's radius does not matter because we assume all of its mass to be concentrated at the center.
Answer:
93.75 m/s
Explanation:
Given:
The frequency of the sound = 750 Hz
The number of pistons making the sound = 8
Revolutions made by the engine = 2000 revolutions/ km
Thus,
the frequency of sound by 1 piston = 750 / 8 = 93.75 Hz
also, it is given that for every other revolution sound is made.
thus, for every 2 revolution sound is made
therefore,
Number of revolutions per second = 93.75 Hz × 2 = 187.5 rev/s
Now,
the speed of the car will be calculated as:
= Number of revolutions per second / Revolutions made by the engine
or
The speed of the car = 
or
The speed of the car = 0.09375 km/s = 93.75 m/s
Answer: It is the product of the (force)multiplied by the (perpendicular) distance from the line of action of the force to the pivot
Explanation:
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