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Electric Circuits
Choose all correct answers and explain your reason for each
The standard heats of formation of the hydrides of group VII elements are HF(-271),
HCl(-92), HBr(-36) These figures indicate that (1) HF is the least stable of them (2) HBr is
the most stable of them (3) HF is the most stable of them
The standard heats of formation of the hydrides of group VII elements are HF(-271),
HCl(-92), HBr(-36) These figures indicate that (1) HF is the least stable of them (2) HBr is
the most stable of them (3) HF is the most stable of them
Electric Circuits
Choose all correct answers and explain your reason for each
In the laboratory experimental determination of the standard heat of combustion of ethanol,
the value obtained might be (1) Lower than expected due to incomplete combustion of the
fuel (2) Lower than expected because some of the heat escape through the exhaust pipe (3)
Lower than expected because the wick of the spirit lamp also burns.
In the laboratory experimental determination of the standard heat of combustion of ethanol,
the value obtained might be (1) Lower than expected due to incomplete combustion of the
fuel (2) Lower than expected because some of the heat escape through the exhaust pipe (3)
Lower than expected because the wick of the spirit lamp also burns.
Electric Circuits
A proton is released from rest in a uniform electric field whose magnitude is 5000 V/m. Through what potential difference will it have passed after moving 0.25 meters? How fast will it be going
after it has traveled 0.25 meters?
after it has traveled 0.25 meters?
Electric Circuits
An electron moving parallel to the x axis has an initial speed of 3.7 x 10^6 m/s at the origin. Its
speed is reduced to 1.4 x 10^5 m/s at x = 2 cm. Calculate the electric potential difference
between the origin and x -= 2 cm.
speed is reduced to 1.4 x 10^5 m/s at x = 2 cm. Calculate the electric potential difference
between the origin and x -= 2 cm.
Electric Circuits
The power, P, obtainable from a wind turbine may be given by P = KL^2p*V^3
Where L = length of the blades, p*= Air density and v = wind speed.
The equation is homogenous.
(a) What is a homogenous equation?
(b) Determine the base units of the constant K.
(c) State two shortcomings of using homogeneity to check the correctness Of a physical equation.
Where L = length of the blades, p*= Air density and v = wind speed.
The equation is homogenous.
(a) What is a homogenous equation?
(b) Determine the base units of the constant K.
(c) State two shortcomings of using homogeneity to check the correctness Of a physical equation.
Electric Circuits
The power, P, obtainable from a wind turbine may be given by P = KL2PV3
Where L = length of the blades, pg Air density, and v = wind speed.
The equation is homogenous.
(a) What is a homogenous equation?
(b) Determine the base units of the constant K.
(c) State two shortcomings of using homogeneity to check the correctness Of a physical equation.
Where L = length of the blades, pg Air density, and v = wind speed.
The equation is homogenous.
(a) What is a homogenous equation?
(b) Determine the base units of the constant K.
(c) State two shortcomings of using homogeneity to check the correctness Of a physical equation.
Electric Circuits
What type of things should be checked when inspecting an electric tool? Select all that apply.
A. Check for frayed power cords
B. Loose plug or broken prongs
C. Check the body of the tool for cracks or other damage
D. The power switch
Can you explain why you chose that letter?
A. Check for frayed power cords
B. Loose plug or broken prongs
C. Check the body of the tool for cracks or other damage
D. The power switch
Can you explain why you chose that letter?
Electric Circuits
What is the formula of DC RL circuits when finding the initial value of current?
Electric Circuits
What is the power required of a dc motor to lift a load of 3 kg accross an inclined plane of 10 degrees from the horizontal plane? (The inclined plane is frictionless).
Electric Circuits
When a potential difference V is applied between the ends of a wire of diameter d and length l , the current in the wire is I. What is the current when a potential difference of 2V is applied between the ends of a wire of the same material of diameter 2d and the length 2l ? Assume that the temperature of the wire remains constant.
