Recent content by firezap

It's a. I look at the graph at x = 3cm and displacement = -1cm. The dot would move left 1cm, so the dot is at 2.

Homework Statement http://i.imgur.com/4dL6TQY.jpg I don't know how to read the figure or the graphs. O_O

thanks, 5π/6 was correct. Confirmed by mastering physics.

What's the period and how to find it? So my period and amplitude and angles are incorrect?

Homework Statement http://i.imgur.com/u8vUv5a.jpg Find the phase constant. Homework Equations x(t)=Acos(ωt + Φ) v(t)=-Aωsin(ωt + Φ) Vmax = ωA ω=2π/T The Attempt at a Solution ω = 2π/12 = 0.5236 A = 60/0.5236 = 114.59 cm v(0) = -30 = -114.59(0.5236)sinΦ 0.5 = sinΦ Φ = π/6 and 5π/6. Which...

Homework Statement The position of a 50 g oscillating mass is given by x(t)=(2.0cm)cos(10t−π/4), where t is in s. If necessary, round your answers to three significant figures. Determine: The total energy. Homework Equations T = 2π/w T = 2π√m/k 1/2kA^2 1/2mv^2 1/2kx^2 The Attempt at a Solution...

the answer is -π/3 for cos and π/6 for sin.

How do you know it's positive? It's clearly negative because of the negative sign in front of amplitude. sinΦ must be negative.

v(t)=-Aωsin(ωt+Φ). sign of derivative is negative. sign of sinΦ is positive. That means in quadrant 1 and 2.

sinΦ= 0.5. Φ=pi/6, 5pi/6 How many answers are there? I'm guessing -π/3 since you asked.

Homework Statement http://i.imgur.com/TZcJkjH.jpg Find the phase constant Homework Equations x(t) = Acos(wt + Φ) x(t) = Asin(wt + Φ) w = 2pi/T The Attempt at a Solution I see A = 20cm. T = 4s. f = 1/4 = 0.25Hz. w = 2pi/4 = 1.57Hz. 10 = 20cosΦ 0.5 = cosΦ Φ = π/3, 5.24?

never mind i got it.

i have the initial velocity what do i solve for next? ε, acceleration, Fe, final velocity? how to find potential difference

Ty what do I do after?

Homework Statement Describe by pointform how to find potential difference between parallel deflection plates, ΔV₂ = ? You don't have to solve. ΔV1 = 1.38 kV Δx = 5 cm Δy = 0.49 cm r = 5.2 cm q = 1.6 x 10^-19 C m = 9.11 x 10^-31 kg k = 9 x 10^9 Nm^2/C^2 Homework Equations ε = ΔV/d W = ΔEe =...