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musickatia [10]
3 years ago
5

Which of the following statements about convection is true? A Convection can only occur during the process of boiling B Convecti

on always involves the circulation of a liquid or gas C All types of currents are convection currents D Convection occurs between solids only at high temperatures
Physics
1 answer:
Ivan3 years ago
6 0
The answer to your question is OPTION D
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Which of the following statements CANNOT be supported by Kepler's laws of planetary motion?
horsena [70]

Answer:

B) A planet's speed as it moves around the sun will not be the same in six months.

Explanation:

A planet's speed as it moves around the sun will not be the same in six months, is a  statement that CANNOT be supported by Kepler's laws of planetary motion.

8 0
3 years ago
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If the current in each wire is the same, which wire produces the strongest magnetic field?
lions [1.4K]

Answer: option 4: A wire that is 2-mm thick and coiled.

Explanation:

The current in each wire is same. The magnetic field due to a current carrying wire increases if the wire is coiled with the more number of turns. A thick wire would cause low resistance to the current. Hence, a 2-mm thick wire which is coiled would produce the strongest magnetic field.

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3 years ago
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Answer:

Party, Birthday, Weddings, Nightclub, Just for fun

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The pressure of air pushing down on a house roof is extremely large. Why is the roof not crushed?
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7 0
3 years ago
An 800-kHz radio signal is detected at a point 8.5 km distant from a transmitter tower. The electric field amplitude of the sign
Temka [501]

Answer:

Explanation:

Given that,

Frequency of radio signal is

f = 800kHz = 800,000 Hz.

Distance from transmitter

d = 8.5km = 8500m

Electric field amplitude

E = 0.9 V/m

The average energy density can be calculated using

U_E = ½•ϵo•E²

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Then,

U_E = ½ × 8.85 × 10^-12 × 0.9²

U_E = 3.58 × 10^-12 J/m²

The average electromagnetic energy density is 3.58 × 10^-12 J/m²

6 0
3 years ago
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