A gas stove uses chemical energy.
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Answer:
A. Doubles.
Explanation:
In an electromagnetic device such as a generator, when a wire (conductor) moves through the magnetic field between the South and North poles of a magnet, an electromotive force (e.m.f) is usually induced across a wire
The mode of operation of a generator is that a metal core with copper tightly wound to it (conductor coil) rotates rapidly between the two (2) poles of a horseshoe magnet type. Thus when the conductor coil rotates rapidly, it cuts the magnetic field existing between the poles of the horseshoe magnet and then induces the flow of current.
When a high-resistance voltmeter is connected to an electric circuit, a deflection will arise due to the flow of electricity. Moving the magnet towards the coil of wire will cause the needle of the high-resistance voltmeter to move in one direction. Also, as the magnet is moved out from the coil of wire, the needle of the high-resistance voltmeter moves in the opposite direction.
In this scenario, a magnet is moved in and out of a coil of wire connected to a high-resistance voltmeter. If the number of coils doubles, the induced voltage doubles because the number of turns (voltage) in the primary winding is directly proportional to the number of turns (voltage) in the secondary winding.
If a ball is if a ball is dropped from a 576ft building it would take about 8 seconds for it to hit the ground.
The cold air sinks as it is heavier
Answer:
a) frictional force = 93.8 N
b) acceleration = 1.29 ms∧-2
Explanation:
The frictional force can be calculated by :
μ k = Fk / N
where:
- μ k = coefficient of kinetic friction = 0.14
- N= normal force or the force perpendicular to the contacting surface
- Weight of the crate, W = mg = (67 × 10) == 670 N
take acceleration due to gravity = 10m/s∧2
The normal force , N = W = 670N ( upward force equals downward force)
Fk = μ k × N
= 0.14 × 670
Fk = 93.8 N
b) To calculate the magnitude of crate's acceleration
F - Fk = ma
where
- Fk = frictional force = 93.8N
- F = horizontal force = 180 N
- m = mass = 67.0 kg
- a = magnitude of acceleration (unknown)
by substituting,
180 - 93.8 = 67a
86.2 = 67a
acceleration, a = (86.2 ÷ 67)
a = 1.29 ms∧-2
