Answer:
Lead metal has a greater magnitude of temperature change.
Explanation:
let the mass of copper and lead be m.
Energy loosed by Copper metal = -Q = -100 J
(Negative sign just indicates that energy is released)
Change in temperature warm of the copper =
Specific heat capacity of copper = c = 0.093 KCal/Kg°C = 389.112 J/kg°C
1 kCal = 4184 Joules
Energy gained by lead metal = Q' = 100 J
Change in temperature lead=
Specific heat capacity of lead = c' = 0.031 KCal/Kg°C = 129.704 J/kg°C
On comparing temperature changes in both metals:
Lead metal has a greater magnitude of temperature change.
Answer:
Assume that by "speed" the problem refers to the horizontal speed of the water jet. The water jet would exert approximately of force on the toy car.
Explanation:
By Newton's Second Law, the net force on an object is proportional to the rate of change in its momentum. The momentum of an object is equal to its mass times its velocity . .
The initial velocity of that of water is . It initial momentum would be:
.
The final velocity of that of water is . It final momentum would be:
.
The change in momentum (in the horizontal direction) is:
.
That took place in . Assume that water leaves the hose at a constant rate. The (average) rate of change in the momentum of that water jet (in the horizontal direction) would be:
.
Note, that one Newton is the same as .
By Newton's Second Law, the net force on the water in the horizontal direction would also be . Gravity acts in the vertical direction, so that would not be part of that force. The only possible source of that force would be the reaction force from the toy car.
By Newton's Third Law, the size of an action force and its reaction force should be the same. As a result, the action force of the water jet on the car should also be approximately .
The answer would a battery or or an emf device but the best option is going to be A.
The mean height for the grass used as a control is equal to the total number of the data came from the control grass divided by the number of control grass in the experiment. The mean height means the average height of the grass.
Answer:
please read the answer below
Explanation:
A). If electric and magnetic forces over the charge allow that the particle describe a straight line, electric and magnetic forces are equal:
electric and magnetic field are perpendicular between them and to the velocity of the charge, hence
v=E/B.
If the particle is moving to the right (+x), we can assume that electric field is upward (+z), and then magnetic field has a direction to out of the paper (+y). Thus, the electric force is directed upward (+z) and the cross product qv X B produces a magnetic force in the -z direction.
B).
E and B are constant, hence, kinetic energy does not change.
hope this helps!