Answer:
B. Removing its iron core
Explanation:
In an electromagnet role of its core is very important as it concentrate magnetic flux to make magnetic field more powerful. Generally core of electromagnet is made up of a ferromagnetic material or of a ferrimagnetic material such as iron. Adding batteries to the circuit and increasing the current through the coil and increasing loops in the coil will increase magnetic strength of an electromagnet.
Answer:
B. removing its iron core
Explanation:
The iron core inside of the wire coil increases the strength of an electromagnet. So removing the iron core would decrease the strength of an electromagnet.
b.it will travel striaight line but eventually slow down
c.it will continue to speed up forever
d.it will slow down and turn
2.a car accelerates down the road .what is the reaction to the tires pushing on the road?
a.the car in the tires moving the car
b.the masses of the car pushing on the tires
c.the road pushing on the tires
d.the road moving away from the tires
differences in pressure
B)
differences in temperature
C)
Earth's revolution round the Sun
D)
the Moon's revolution round Earth
Answer:
Correct Answer is B (Differences in temperature)
Explanation:
One of the main cause of ocean current to occur is variation of temperature of different layer of oceanic water.Water which have high temprature is less dense and this Less density water float above the surface of high density water. When this less density water reached on the surface of ocean that time wind which blows on the surface water makes the water cool or in other words we can say that water released its heat to the surrounding environment. when water becomes cool it again shifted in downward direction and less density water will moves upward. In this way this process will continue and hence ocean current is created.
Answer:
Tides are the rise and fall of sea levels. Tides occur due to the gravitational forces exerted on the Earth by moon, and to a lesser extent, the sun. That's why tides occur in ocean or sea.
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The unit of energy is called the joule (J). Energy is measured in joules (J)
The joule is named after the English physicist James Prescott Joule. It is defined as the energy transferred to an object when a force of one newton acts on it through a distance of one meter. Other units of energy include the calorie (cal), the kilowatt-hour (kWh), and the British thermal unit (BTU).
The calorie is the amount of energy needed to raise the temperature of one gram of water by one degree Celsius. The kilowatt-hour is the amount of energy used by a 1,000-watt appliance in one hour. The British thermal unit is the amount of energy needed to raise the temperature of one pound of water by one degree Fahrenheit.
The joule is the most commonly used unit of energy in physics and engineering. It is also the unit of energy used in the International System of Units (SI).
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