The kinetic energy of the car is
Explanation:
The kinetic energy of an object is the energy possessed by the object due to its motion.
Mathematically, the kinetic energy is
where
m is the mass of the object
v is its speed
For the car in this problem,
m = 740 kg
v = 33.5 m/s
Therefore, the kinetic energy of the car is
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Answer:
I'm pretty sure it'sssss A
I think C because it's the only one with a an angle T of 30° (The string)
3] A snowball picks up speed as it rolls down the mountain.
Explanation:
Newton's second law states that:
where
F is the net force acting on an object
m is the mass of the object
a is the acceleration of the object
When the net force acting on the object is zero, we say that the object is acted upon balanced forces; when the net force is non-zero, we say that unbalanced forces are acting on the object. From the formula, we see that when unbalanced forces are acting on the object, the object has an acceleration different from zero: this also means that the velocity of the object is changing.
So, we can say that if there are unbalanced forces, then the object's velocity is changing. Among the choices given, we see that velocity is changing only in options 3) (the snowball is speeding up, so it has an acceleration), while in all other cases the velocity is constant. Therefore, option 3) is the correct one.
The strength of electric field E is 17 N / C.
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<u>Explanation:</u>
Electric field strength is defined as the force per unit charge acting at a point in the given field. The equation for the strength of the electric field is given by
E = F / q
where E represents the electric field strength,
F represents the force in newton,
q represents the charge in coulomb.
Given the charge q = 0.30 coulombs
force F = 5.0 N
Electric field strength E = force / charge
= 5.0 / 0.30
E = 16.66 = 17 N / C.