Recent content by hk4491

Homework Statement [SIZE="3"]A rocket has an initial mass of m[SIZE="1"]0 = 30,000 Kg, from which 80% is fuel. The fuel is being burned at a rate of R = 200 kg/s and the gas is expelled with a velocity of v[SIZE="1"]rel = 1.8 km/s. The velocity of the rocket is calculated by: [SIZE="4"]v...

I included in my calculations that the primary force being acted against is the weight of the cable cars, over the distance of the entire cable which is 5.6 km, with a time of 60 minutes.

Homework Statement A cable railway in Austria has a length of 5.6 km. The cars on the cable need 60 minutes for a whole trip along the cable. Assume that 12 cars with a payload of 550 kg are traveling upwards, and 12 empty cars are traveling downwards. The angle between the cable and the...

In the second part they're asking me to find the charge of each particle. I know I should use this formula: F = k.q^2/r^2 and solve for q. As my force should I substitute 2*ma, since there are two particles, or is one enough?

Great, thanks for the explanation!

Hi, thanks for replying. Are the forces produced by the two particles equal? Because then I can use Newton's second law as such: m1a1=m2a2 Would this be correct?

Thanks I realized my mistake in the integration part. That leads to x(t)= 5/16 t^2. The body starts moving at t0=0, so at any given point of time Δt = t - t0 = t Hence: P= (F*d)/t P(t) = 25/16 t

Homework Statement A force of 5 N acts upon a body of 8 kg in the +x direction. Formulate an expression for the power generated as a function of time. The body is in the beginning at t=0 and x=0 (Sorry I'm translating this question from German, so excuse the mistakes). Homework Equations...

Homework Statement Two particles with a similar charge are held at a distance of 3.2*10^-3 m and then released. The acceleration of the first particle is measured at 7.0 m/s^2, and for the second at 9.0 m?s^2. The mass of the first particle is 6.3*10^-7. What is the mass of the second...