Answer:
Force will be acting southward and the magnitude of force will be 1000 N
Explanation:
given,
mass of car = 1000 Kg
initial speed of the car (u) = 20 m/s
final speed of the car (v) = 0 m/s
distance to stop the car = 200 m
using equation of motion
v² = u² + 2 a s
0 = 20² + 2 x a x 200
400 a = -400
a = -1 m/s²
Now, we know
Force = mass x acceleration
F = 1000 x -1
F = -1000 N
- ve sign of force represent force will be acting in the opposite direction of motion.
Force will be acting southward and the magnitude of force will be 1000 N
Answer:
Explanation:
Make up a question.
The only change is going to be c.
Suppose they aluminum starts our higher at 50oC
Suppose the copper starts out at 20oC
Suppose the mass of both are 25 grams.
Aluminum
m*2c * deltat
- deltat = 50 - x
- c = 2*c
- m = 25
Copper
m*c*deltat
deltat = x - 20
m = 25
c = c
Now since the amount of heat is the same (this starts out on a heated slab of something).
m*2c * (50 - x) = m * c * x - 20 The m and the c are the same. Cancel them out.
2 * (50 - x) = (x - 20) Remove the brackets.
100 - 2x = x - 20 Add 20 to both sides.
120 - 2x = x Add 2x to both sides.
120 = 3x Divide by 3
x = 40
What does this tell you?
It tells you that the temperature of the aluminum is only going to drop 10 degrees
The copper is going to gain 40 - 20 = 20 degrees.
The heat transfer is actually the same. It doesn't take as much heat to heat copper as it does aluminum. That's shown by the difference in how the temperature changes. One looses 10 degrees. The other gains 20. The transfer is the same because of the way the "c" operates.
Answer:
Explanation:
Angular momentum is given by mvr where m is mass of the car, v is the speed of the car and r is the distance from the centre of the lane.
In this case, mass is 2500 lbs which to convert to Kg we multiply by 0.453592 hence 2500*0.453592=1133.98
Also, the speed we convert from mph to m/s by multiplying by 0.44704 hence 30*0.44704=13.4112 m/s
Finally, the distance given in ft is converted to m by multiplying it by 0.3048
The angular momentum will then be 
Explanation:
The dimensional formula is a compound expression showing how and which of the fundamental quantities are involved in making that physical quantity. The dimensional equation of a physical quantity is an equation, equating the physical quantity with its dimensional formula
