A certain sample carries a current of 4 A when the potential difference is 2V and a current of 10 A when the potential difference is 4V. This sample:
A) obeys Ohm law
B) has a resistance of 0.5 ohms at 1V
C) has a resistance of 2.5 ohms at 1V
D) has a resistance of 2.5 ohms at 2V
E) does...
Homework Statement
A 10-ohm resistor has a constant current. If 1200 C of charge flow through it in 4 minutes what is the value of the current?
A) 3.0 A
B) 5.0 A
C) 11 A
D) 15 A
E) 20 A
The Attempt at a Solution
I get B as an answer. I=(Q/t). I= 1200C/ (4 * 60) = 5.0 A
The book...
A current of 0.3 A is passed through a lamp for 2 minutes using a 6 V power supply. The electrical energy dissipated by this lamp during the two minutes is:
a) 1.8 J
b) 12 J
c) 20J
d) 36 J
e) 216 J
If someone could just help me to start off that would be great.
The main equations I...
The work in joules required to carry a 6.0 C charge from a 5.0 V equipotential surface to a 6.0V equipotential surface and back again to the 5.0V surface is:
A) 0
B) 1.2 X 10^-5
C) 3.0 X 10^-5
D) 6.0 X 10^-5
E) 6.0X10^-6
Can someone please explain how to start off doing this problem. I...
I need to determine whether these certain chemicals are polar or not:
Beta- sitosterol
Methyl cinnamate
Lapachol
Ethyl p-hydroxy cinnamate
Betulic acid
3,4,5- trihydroxy-7-methoxy flavone
Veratric acid
p-anixic acid
Many of them are difficult, If there is a website that...
Sorry, I won't double post
It says that the holding force for the swing is horizontal. I have the two holding forces going up on by free body diagram, the weight force going down, and the 100N force horizontal.
question
A 160N child sits on a light swing and is pulled back and held with a horizontal force of 100N. The tension force of each of the two supporting ropes is:
work:
The tension force of the Ta and Tb must support the weight of the child and the horizontal force of 100N.
so:
Ta +...
physics
I rechecked it
If a wheel turns with a constant rotational speed:
each point on its rim moves with a constant translational velocity
each point on its rim moves with a constant translational acceleration
the wheel turns through equal angles in equal times
the angle through which...
First questionThree identical balls, with masses M, 2M, and 3M are fastened to a massless rod of length L as shown. The rotational inertia about the left end of the rod is: Thats the layout below. Would calculus be needed in this problem (intergration) because then I am in trouble. I know the...
Torque
Homework Statement
A 160 N child sit on a light swing and is pulled back and held with a horizontal force 100 N. The tension force of each of the two supporting ropes is:
A uniform plank is supported by two equal 120N forces at X and Y at both ends of the plank.The support at X is...
If a wheel is turning at 3.0 rads/s, the time it takes to complete one revolution is about:
3.0 rads/s X 1 revolution/6.28 rads = .477 revolutions/s
I just need to get the number of seconds to complete one revolution. Please explain how to go about this just step wise. Thank you.
The...
For the first problem I just want the answer in seconds, not seconds/revolutions
I put 3600 seconds because it is the amount of time for the minute hand to make one full revolution around the clock