Recent content by Yoruichi

Horizontal distance traveled.. Oh wait, I think I get something.. *edit

Homework Statement A ball is thrown at angles 45° and 30° above the horizontal with the same initial speed. What multiple of the horizontal range at angle 30° is that at angle 45°? Homework Equations Trigonometry formula The Attempt at a Solution I think that first step is to divide the...

Let V2 = 2V1 M1U1 = M1V1 + M2V2 M1U1 = M1V1 + 2M2V1 V1(M1+2M2) = M1U1 V1 = M1U1 / (M1 + 2M2) CR = (2V1 - V1) / U1 CR = V1 / U1 Sub V1 = M1U1 / (M1 + 2M2) CR = V1 = M1U1 / (M1 + 2M2) / U1 CR = V1 = M1U1 / (M1 + 2M2) x (1 / U1) CR = M1 / (M1+2M2) This is the correct answer, thanks a lot! :D

The velocity will also be 2 times faster than A, so the ratio of both distance and velocity will be 1:2. Am I right? So the next step would be substitute the ratio into the formula?

I think its velocity after the collision will be faster.

Thanks for the replies! Below is my attempt according to the two formulas. M1U1 + M2U2 = M1V1 + M2V2 Since U2 = 0, M1U1 = M1V1 + M2V2 U1 = (M1V1 + M2V2) /M1 V1 = (M1U1 - M2V2) / M1 V2 = (M1U1 - M1V1) / M2 Using the formula Cr = [ (M1U1 - M1V1) / M2) - (M1U1 - M2V2) / M1] / [(M1V1 + M2V2)...

Homework Statement As shown in the figure below, small object A (mass: M) collides with small object B (mass: m), which is initially at rest, on top of a horizontal stand fixed to a horizontal floor. Both A and B proceed to shoot horizontally off the stand and fall to the floor. Horizontal...

Oh I see! So the 720 Hz is actually detected frequency instead of source frequency.. Therefore I have to divide my solution into two parts, which is to find out the frequency of detector first, and then only continue with my attempt above! 720 Hz = (340 + 20) / 340 x Fs Fs = 720 x 340/360...

Homework Statement When a train running at a speed of 72 km/h approaches a crossing signal, a passenger in the train hears the siren at 720 Hz. What frequency does the passenger detect after the train passes the crossing signal? Take the speed of sound in air to be 340 m/s. Homework Equations...

Oh! My bad. So does it means that all the assumptions of current is to find out the operating point of the load line in the graph? The current throughout the series circuit must be constant, so the assumptions cannot be the right current. Thus, the answer is straightforward which is the...

Yea I think I got it already, since I = 1.8 A and V = 2 V, the power consumed should be P = 1.8 x 2 = 3.6 W And the best answer would be 4 W Thank you so much gneill and cnh1995! Really appreciated it!

I am not familiar with KVL too.. All I know about it is only the algebraic sum of all voltages in a enclosed circuit must be equal to 0. But based on the characteristic of the full circuit, I wonder if the graph will look like this...

My apologize, I have never learn the concept of load line before, that's why I thought this question is simple and didn't put in much effort. I'm sorry. Did you mean the concept of in series circuit, the current throughout the circuit is constant, and the voltage will drops when lose in...

My first attempt: P = VI According to the graph, when V = 12, I = 3.5 P = 12 x 3.5 = 42 My second attempt: P=V^2 / R = 12^2 / 5 = 144/5 = 28.8 It's wrong because I compared my attempts with the answer ofc. The answer is 4.

Homework Statement Figure 1 shows the relationship between voltage and current when voltage is applied to a certain light bulb. Next, as shown in Figure 2, the bulb is connected in series with a 12-V battery and a 5 ohm resistor...