Recent content by trolling

Ignore. I just forgot the integral of 1/x. (ln x)

Homework Statement An infinite straight wire carries a current I that varies with time as shown above. It increases from 0 at t = 0 to a maximum value I1 = 5.2 A at t = t1 = 15 s, remains constant at this value until t = t2 when it decreases linearly to a value I4 = -5.2 A at t = t4 = 26 s...

Homework Statement The base of a 20-meter tower is at the origin; the base of a 20-meter tree is at (0,20,0). The ground is flat & the z-axis points upward. The following parametric equations describe the motion of six projectiles each launched at time t = 0 in seconds. (i refers to x-axis...

An equation that might be useful in this problem is the range equation, where ∆x = ((v-init.)^2 * sin (2α)/g), where α is the angle & g is gravitational acceleration (9.8 m/s^2). Solve for v-init to get 14 m/s. You then divide the initial speed into its components by dividing both of them (x &...

I tried using the work-energy theorem (W = ΔKE) & applied it to the problem. I'm not too sure about using the moon; I was hoping someone would know about whether to use it or not.

Homework Statement You plan to take a trip to the moon. Since you do not have a traditional spaceship with rockets, you will need to leave the Earth with enough speed to make it to the moon. Some information that will help during this problem: mass of Earth = 5.9742 x 10^24 kg radius of...

I just typed it in, & it's correct. Thanks for your help!

So how do you suggest that you find the upper crate's acceleration?

1. Homework Statement Two wooden crates rest on top of one another. The smaller top crate has a mass of m1 = 24.0 kg and the larger bottom crate has a mass of m2 = 86.0 kg. There is NO friction between the crate and the floor, but the coefficient of static friction between the two crates is...

The coefficients of friction are for the first block.

Actually, the trick here is that the rope is actually perpindicular to the force of gravity.

Ok, I have a FBD set up, but since this site won't let me post it, I can't show it. Looking at your last statement, I'm guessing that the x-component of the weight (37.469N) MIGHT be equal to the x-component of the tension. I then used that component to divide by cos 31° to get the overall...

Homework Statement A block with mass m1 = 9.4 kg is on an incline with an angle θ = 31.0° with respect to the horizontal. Now a new block is attached to the first block. The new block is made of a different material and has a coefficient of static friction μ = 0.9. What minimum mass is...

Homework Statement A block with mass m1 = 9.4 kg is on an incline with an angle θ = 31.0° with respect to the horizontal. There is also a massless rope that pulls horizontally to prevent the block from moving. What is the tension in the rope? Homework Equations Fg = m*g Fg,x = m*g*sin...