A block with a speaker bolted to it is connected to a spring having spring constant k = 21.0 N/m, as in Figure P17.40. The total mass of the block and speaker is 46.00 kg, and the amplitude of this unit's motion is 0.475 m. Assume that the speed of sound is 343 m/s.
Figure P17.40...
(a) A light balloon is filled with 371 m3 of helium. At 0°C, the balloon can lift a payload of what mass?
(b) In Table 14.1, observe that the density of hydrogen is nearly half the density of helium. What load can the balloon lift if filled with hydrogen?
I really have no clue where to...
Yes, that worked out. Thanks a lot for the help. I actually have one more question:
At the Earth's surface a projectile is launched straight up at a speed of 10.3 km/s. To what height will it rise? Ignore air resistance and the rotation of the Earth.
Now this question is listed under...
6. [PSE6 12.P.022.] Stephen is pushing his sister Joyce in a wheelbarrow when it is stopped by a brick 7.83 cm high (Fig. P12.22). The handles make an angle of 15.0° below the horizontal. A downward force of 389 N is exerted on the wheel, which has a radius of 20.3 cm.
There was a similar...
lol...I had a feeling it was zero, but for some reason I thought it'd be simple then.
I'm having a problem with the rest of the question thought:
(d) What is increase in internal energy of the block-surface system due to friction?
J
(e) Find the total change in the block's energy...
A 14.0 kg block is dragged over a rough, horizontal surface by a 87.0 N force acting at 20.0° above the horizontal. The block is displaced 6.50 m, and the coefficient of kinetic friction is 0.300.
(b) Find the work done on the block by the normal force.
J
(c) Find the work done on the...
A raindrop of mass 3.34 x 10^-5 kg falls vertically at constant speed under the influence of gravity and air resistance. Model the drop as a particle.
(a) As it falls 50 m, what is the work done on the raindrop by the graviatational force?
J
(b) What is the work done on the raindrop by...
Well I tried some forms of the centripetal acceleration formula for the upper tension, and I also tried 3.85*9.88(cos of the angle) + 1/2 the horizontal force, but they haven't worked out.
Everyone I know is having problems with this question:
3. [PSE6 6.P.011.] A 3.85 kg object is attached to a vertical rod by two strings as in Figure P6.11. The object rotates in a horizontal circle at constant speed 7.30 m/s.
Figure P6.11
(a) Find the tension in the upper string.
N...