The only correct statement on that list is <em>choice-C</em>: If a positively charged rod is brought close to a positively charged object, the two objects will repel.
Answer:
first
Explanation:
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Thorns protect plants from insects or harmful bugs.
Answer:
density; thermal
Explanation:
Convection currents occur in fluids because of temperature and density differences. Convection currents transfer thermal energy throughout a fluid.
<em>When a fluid is heated, the molecules closest to the heat source gets heated first and their temperature is raised. The rise in temperature lowers their density and as such, they move to the upper portion of the fluid to be replaced by yet-to-be-heated molecules at the upper portion. </em>
<em>When the replacement molecules also get heated, the same process occurs and a to-and-from rotational movement of molecules, also known as convection current, is created within the fluid. The to and from movement, thus, transfer thermal energy within the fluid until all the molecules within the fluid are at the same temperature.</em>
Answers:
a) 0.144 Hz
b) 0.904 rad/s
c) 11.818 m
d)
Explanation:
The rest of the question is written below:
a) Calculate the frequency of oscillation (in Hertz) of the chandelier
b) Calculate the angular frequency of the chandelier in radians/ second
c) Determine the length in meters of the chandelier
d) That evening, while hanging out in JJ. Thompson's House O' Blues, you notice that (coincidentally) there is a chandelier identical in every way to the one at the Michelson exhibit except this one swings back and forth 0.01 seconds slower, so the period is . Determine the acceleration due to gravity in at the club.
a) The frequency has an inverse relation with the period :
(1)
Where
(2)
b) The angular frequency is given by:
(3)
(4)
(5)
c) Another expression for the period is:
(6)
Where:
is the length of the pendulum
is the mean acceleration due gravity
Isolating :
(7)
(8)
(9)
d) In this case the period of the pendulum is . So, we will use equation (7) with this period and find :
(10)
(11)
(12) This is the acceleration due gravity at the place, which is near the mean value of