Answer:
<h2>a) positivo.</h2>
Explanation:
The question is
The work done by gravity during a projectile decline is:
a) Positive.
b) Negative.
c) Zero.
d) Depends on y-axis direction.
e) Depends on x-axis direciton.
Remember that Work is defined as the energy needed to move an object. Mathematically, it's the product between the force exerted and the displacement. That means if we don't have any displacement, then there's no work.
In this case, we are talking about the work done by the gravity force. When a projectile goes down, it's because of the gravity force, which means it can't be zero.
Specifically, the work done by gravity is positive, because when the projectile is going down, it's getting closer to the atracttive mass, which is Earth.
Therefore, the right answer is a.
Answer:
Explanation:
From the question we are told that:
Force 
Time 
Length of pedal 
Radius of wheel 
Moment of inertia, 
Generally the equation for Torque on pedal 
is mathematically given by
Generally the equation for angular acceleration 
is mathematically given by
Therefore Angular speed is \omega
Generally the equation for Tangential velocity V is mathematically given by
Answer:
D. Sound Energy, Magnetic energy
Explanation:
Sound energy is in motion, and Magnetic energy is about to be in motion.
Answer: Choose the normal force acting between the object and the ground. Let's assume a normal force of 250 N.
Determine the friction coefficient.
Multiply these values by each other: 250 N * 0.13 = 32.5 N .
You just found the force of friction!
Explanation:
Answer:
D) wood rubbed against a rough surface feels hot
Explanation:
The heat is transferred from one form of energy (friction of the wood being rubbed against the surface) to another (heat energy).
