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:
1 Watt = 1 J/s
1200 J/s(2 min)(60 s/min) = 144 KJ
The magnitude and direction of the electric field at the position of this charge.3.33 N/C upward
An electric field is the electric force per unit of charge. It is assumed that the field's direction corresponds to the direction in which a positive test charge would experience force. The electric field is directed radially inward toward a negative point charge and radially outward from a positive charge.
Value of force F given = 10N
value of charge Q = 3 C
We know that E = F/Q
E = 10/3
= 3.33N
where charge is scalar quantity so the direction of force is the direction of electric field
Hence the magnitude and direction of the electric field at the position of this charge.3.33 N/C upward
Learn more about Electric field here
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Answer;
B. Mass and energy are equivalent.
Explanation;
-Each of the letters of E = mc2 stands for a particular physical quantity.
E is the energy, m is the mass and c is the speed of light (m/s)
Energy = mass x the speed of light squared
-The equation E=mc2 explains nuclear fusion, how matter can be destroyed and converted to energy and energy can be converted back to mass. It explains the atomic energy produced by nuclear power plants and the atomic energy released by atomic bombs.
-The equation tells us that mass and energy are related, and, in those rare instances where mass is converted totally into energy, how much energy that will be.
