# Search results

1. ### 1D Kinematics

Have you been taught all of the basic kinematic equations? If so, look at each of them. You'll find that each one has a different variable missing. Knowing this all you have to do is look for the equation with all the variables you're given and the variable you need and then use that.
2. ### Find the total displacement on a velocity-time graph

Okay. You understand that, as a vector quantity, displacement is a number value representing distance combined with an angle, measured from a certain point. This problem takes away the need for an angle, because the car can only move in two directions - forward and backward. This makes it easy...
3. ### Find the total displacement on a velocity-time graph

So what you don't get is the reason one of the areas subtracts from the other?
4. ### Find the total displacement on a velocity-time graph

What exactly doesn't make sense? Do you understand what the product of a velocity-time actually is graph is? Are you aware of the vector nature of velocity and displacement?
5. ### Find the total displacement on a velocity-time graph

Give it a crack first. Write up your attempt here :) It's against the rules of the forum to give help without the asker proving they're not just being a slacker.
6. ### Can anyone explain to me why this works? Calculating power w/ voltage and resistance

Power is given by P = VI. V, voltage, is energy per charge (Joules per coulomb) I, current, is charge per time (Coulombs per second) From this we can see that if we increase the voltage, the overall energy output will increase. We can also see that if we increase the current, the same will...

Equation.
8. ### Block Acceleration up an Inclined Plane

Well static friction is the frictional force between the mass and the plane when the mass is stationary. For example if I had a 10kg mass and a Us of 0.1, the frictional force would be mg0.1. We'll take that to equal 10N because I'm feeling lazy and 9.81 is just too much. So the frictional...
9. ### Block Acceleration up an Inclined Plane

Yes, however don't expect any help from me on that one. I could sit down for a while and try it but I'm by no means a physics guru like some of the people here. While you can apply the same principles, there's a few other principles you need to apply. Like force to overcome static friction etc...

Yes.
11. ### Block Acceleration up an Inclined Plane

Don't make it too easy..
12. ### Block Acceleration up an Inclined Plane

Take azizlwl's advice and draw a force diagram. That being, if you don't know, a simplified picture of the situation showing planes, masses and forces and any relevant angles and figures. In this case you would draw a box sitting on an inclined plane, fill in the angle of the plane and any...
13. ### Capacitance and voltage relationship

Are you reading "percentage difference" as "percentage potential difference" or something similar?
14. ### Capacitance and voltage relationship

Where is that stated? If so, why is the answer given farads? Additionally, bearing in mind that I'm yet to study capacitors in any level of detail, does the voltage not correspond to a maximum input voltage that the device can handle without being damaged, destroyed, or at least cease to function?
15. ### Capacitance and voltage relationship

The stated capacitance is 1000. The possible variance is -10% to +50%. What is 10% of 1000 subtracted from 1000? What is 50% of 1000 added to one thousand?
16. ### Block Acceleration up an Inclined Plane

Remember that forces are vectors and can act in different directions. Think about which forces act in which direction (Up or down the hill) in the problem. The 3.5kN work to accelerate the block .... the hill, gravity and friction work to accelerate the block .... the hill. Together they make a...
17. ### Voltage across a load resistor in a Voltage Divider Circuit

Okay. Now I understand. Vaguely, but I think I understand. Thanks very much. I think I need to refine my basic understanding of electricity itself. I'm still in that rut where I imagine electrons coming out of a battery instead of merely being pushed/dragged along by it.
18. ### Voltage across a load resistor in a Voltage Divider Circuit

Hey Nascent. Can you explain to me why the current is relative to the 2.2k as opposed to the resistor across which voltage is being measured?
19. ### Voltage across a load resistor in a Voltage Divider Circuit

Homework Statement Show that V across Resistor Rkohms is: (11R) / (3.96 + 4R) V The circuit is a 5V cell in series with a 1.8k resistor. Following the 1.8k resistor are a 2.2k and Rk resistor in parallel with eachother. The wires then rejoin and return to the cell. Current through the...