Other Physics Answers

Emmanuel Zacchini launched as a human cannonball in 1940 soared over three Ferris wheels each 18.0 m high covering a horizontal distance of 10.63m. a.) Assuming that the point of projection is 2.50 m above the ground and that he landed safely on a net placed at the same level, find his initial velocity. b.) Assuming that he missed the net and landed on the ground, with what velocity will he strike the ground?

Emmanuel Zacchini launched as a human cannonball in 1940 soared over three Ferris wheels each 18.0 m high covering a horizontal distance of 10.63m. a.) Assuming that the point of projection is 2.50 m above the ground and that he landed safely on a net placed at the same level, find his initial velocity. b.) Assuming that he missed the net and landed on the ground, with what velocity will he strike the ground?

Find the force necessary to keep the toy car in equilibrium. The mass of the toy is 5kg and the inclination of the plane is 30°. Friction is neglected.

Please show the complete solution.

A girl is pressing a 2kg book against a vertical wall. If the coefficient of friction between the book and the wall is 0.30, how hard should the girl push to allow the book to slide down the wall at constant speed?

Please show the complete solution.

A force of 20N pulls two carts tied together with a string. The carat with masses 3kg and 4kg, respectively, run on a smooth level surface. Find :

a. The acceleration of the 4kg cart

b. The acceleration of the 3kg cart

c. The tension on the string connecting the two carts.

A block of mass 5.00 kg rests on a horizontal surface where the coefficient of kinetic friction between the two is 0.200. A string attached to the block is pulled horizontally, resulting in a 3.00 m/s² acceleration by the block. Find the tension in the string. (g = 9.80 m/s²)

A violin string 15.0cm long and fixed at both ends oscillates in its n=1 mode. The

speed of waves on the string is 250ms-1 and the speed of sound in air is 348ms-1. Find,

(i)the frequency of the waves

(ii)the wavelength of the emitted sound.

(b)A closed organ pipe 60cm long and of cross-sectional area 50cm2 is resonating at its

fundamental frequency. If the amplitude of the air at the open end is 0.20cm, find the

acoustic power radiated.

(c)A plane sound wave traveling through air has maximum acoustic pressure

of 10-2Nm-2. If the speed of sound is 343ms-1, and the density is 1.29kgm-3, find the

average kinetic energy density of the gas.

A source of sound wave produces waves in air of wavelength 1.65,if the speed of sound in air is 330ms-¹ the period of vibration in second is?

A metal bar that has a cross-sectional area of 4,0 cm² and length of 50.0 cm is stretched by a force of 1.0x10⁴ N.

i) Find the stress on the wire.

ii) If the bar elongates by 0.5 cm, what is the strain in the wire?

iii) Determine the Young’s Modulus of the wire.

iv) Calculate the strain energy per unit volume stored in the wire.

A stone is thrown straight downward with initial speed 8.0 m/s from a height of 25 m. Find (a) the time it takes to reach the ground and (b) the speed with which it strikes.