If the force moving an object points at least partially in the opposite direction of the objects motion, the work is considered to be negative.
<u>Explanation:
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Work done is the measure of displacements caused on an object by the amount of force acting on it. The work done can be positive or negative. If the direction of force acting on an object is along the direction of motion of the object then the work done is positive.
This is because, in this case the external force is helping the object to continue its state of motion. So, if the force acting on the object is in completely opposite or partially opposite direction to the direction of motion of the object, it will stop or slow down the motion of the object.
This kind of force will have negative direction to the motion of the object and hence the work done will also be negative.
Answer:
The strength of an electromagnet can be increased by increasing the number of loops of wire around the iron core and by increasing the current or voltage. You can make a temporary magnet by stroking a piece of iron or steel (such as a needle) along a permanent magnet.
There are three things that dictate how strong this field is:
1.How much kinetic energy you provide the wire
Answer is changed by pushing more current through the wire.
2. How permeable our magnetic rod is
Answer is changed by picking a more magnetic media
3.How many little magnetic fields you generate to make the net, large magnetic field
Answer is changed by increasing the amount of turns of the wire. More turns, more little fields, strong big field
Answer:
Neptune is approximately 41 times as far from the sun as Venus
Explanation:
Estimate = distance of Neptune from the sun ÷ distance of Venus from the sun = 4.5×10^9 ÷ 1.18×10^8 = 40.9 (approximately 41)
Hi there!
Use the following equation: (Newton's Second Law)
∑F = ma, where:
∑F = net force (J)
m = mass (kg)
a = acceleration (m/s²)
Plug in the given values:
∑F = 1500 · 40 = <em>60,000 J</em>
Answer:
a.
b.30.4 N
Explanation:
We are given that
Mass of block=m=1.1 kg
Mass of cart=M=3.4 kg
Total mass=m+M=1.1+3.4=4.5 Kg
1.We have to find the maximum acceleration such that block does not slide on the cart.
Normal force=
Substitute the values
Using
Hence, the maximum acceleration such that block does not slide on the cart=
b.
Using the formula
Hence, the magnitude of the force on the cart required to provide the maximum acceleration=30.4 N