Recent content by bluewood

Homework Statement An air race pilot with 54 kg makes a vertical loop with 1200 m of radius, in such a way that the airplane's speed decreases at a constant rate. Knowing that the airplane's seat force acting over the pilot is 1680 N at point A and 350 N at point C, determine the airplane's...

Something like this? 1.2 \times W - 1.2 \times R_n = 0 1.2 \times 800 \times 9.8 - 1.2 \times R_n = 0

The force in the x direction that makes the van move: v = \frac{60 \times 10^3}{3600} m/s \approx 16.667 m/s a = \frac{16.667}{4} = 4.16675 m/s^2 F_x = 800 \times a I suppose the normal reaction acts in the y direction and is located under the wheels. The F force acting at point P...

Homework Statement The following camping van with a total mass of 800 kg is connected at point P to the back of a car. The car accelerates with constant acceleration a during 4 seconds from rest until it achieves 60 km/h. Assuming there is no resistance (from air and ground), calculate the...

If the outside shell only has charges on its surface, the potential inside will be constant. On a first guess it can't be zero. But then again there's that middle sphere. I remember seeing in my book an equation that calculates the electric field of a sphere whose charge is distributed equally...

This was a matter approached in my previous semester, and my "guess" (because that's the first problem of this kind where I see a sphere with a ground connection and I can't be sure) is that the middle sphere has charge 0 Q on its surface (due to that ground connection). It is an interesting...

You are correct. Actually, that imaginary value in my previous calculations in the speed was due to an error in the limits of integration. I've tried several (fixed) frames of reference and all yielded the correct value for the speed. Thanks :biggrin:

Thanks for the remark, I've managed to find the correct solution. I've tried several times before, and one of the steps that was confusing me before was when I was calculating the speed of the cone before hitting the cone. If I considered a frame of reference where g = -9.8 m/s2, the speed...

Homework Statement To find the stiffness of a material, a block of that material is placed 30 cm under a metallic cone with 0.3 kg; the cone is free falling from rest, penetrating a distance x in the block until it stops. It is known that when the cone penetrates in the block the force of the...