Answer:
Explanation:
<u>Net Force
</u>
The second Newton's law explains how to understand the dynamics of a system where several forces are acting. The forces are vectorial magnitudes which means the x and y coordinates must be treated separately. For each component, the net force must equal the mass by the acceleration, i.e.
The box with mass m=20 kg is pulled by a rope with a angle above the horizontal. It means that force (called T) has two components:
We'll assume the positive directions are to the right and upwards and that the box is being pulled to the right. There are two forces in the x-axis: The x-component of T (to the right) and the friction force (to the left). So the equilibrium equation for x is
There are three forces acting in the y-axis: The component of T (upwards), the weight (downwards), and the Normal (upwards). Since there is no movement in the y-axis, the net force is zero and:
Rearranging:
Solving for N in the y-axis:
The friction force is given by
Replacing in the equation for the x-axis, we have
Replacing the formula for N in the equation for the x-axis
Operating and rearranging
Solving for T:
Plugging in the given values:
The gain in gravitational potential energy of the mass = 100 kg m^2 / s^2.
<u>Explanation:</u>
Gravitational potential energy is an energy in which an object possesses because of its position in a gravitational field. The most common use of gravitational potential energy is for an object near the Earth's surface where the gravitational acceleration can be assumed to be constant at about 9.8 m/s2.
The formula for the gravitational potential energy is the product of mass, gravity, and height.
GPE = m *g *h
where m represents mass in kg,
g represents the gravity,
h represents the height.
GPE = 5 * 10 * 2 = 100 kg m^2 / s^2.
Conduction is (usually always) the transfer of any thing including heat.
Answer:
E= 3.186 * J
Explanation:
mass of atom =m=3.54 × kg.
speed of light =c= 3*
energy equivalence=E= ?
E =m c²
= 3.54 × *
E= 3.186 * J
Answer:
A=z+n
A=20+20
A=40
Explanation:
Not sure if I'm correct but I was taught that mass number is calculated by A=z+n where A is the mass number, z is the proton number and n is the number of neutrons.