IV. Work out (show all the necessary steps) 1. The velocity ratio of a certain inclined plane is 4. The efficiency of this machine while a trolley
is moving with a constant velocity up its surface is 60%.
A, determine the angle that the inclined plane makes with the horizontal
B. find the actual mechanical advantage of the machine
C, calculate the coefficient of kinetic friction b/n the trolley and the surface of the incline.
2. An inclined plane rises 30cm for every 50cm distance measured up the plane. The coefficient of
kinetic friction in the surface of the incline and a block of weight 400N, which is pulled up the
plane is 0.2. find
A. The minimum effort force acting on the object parallel to the plane
B, the velocity ratio, and
C, the efficiency of the system,
3. A wooden block of mass 2kg is 20cm thick, 10cm wide and 30cm tall. Calculate
A, the minimum pressure the block exert on the surface
B, the maximum pressure the block exerts on the surface

Acylindrical specimen of a nickel alloy having an elastic modulus of 207 gpa (30 × 106psi) and an original diameter of 10.2 mm (0.40 in.) experiences only elastic deformation when a tensile load of 8900 n (2000 lbf) is applied. compute the maximum length of the specimen before deformation if the maximum allowable elongation is 0.25 mm (0.010 in.)

Exercise 2. find the wavelength of a photon emitted when an electron jumps from the n = 3 energy level down to the n = 2 energy level. where is this photon in the electromagnetic spectrum?

To understand the behavior of the electric field at the surface of a conductor, and its relationship to surface charge on the conductor. a conductor is placed in an external electrostatic field. the external field is uniform before the conductor is placed within it. the conductor is completely isolated from any source of current or charge. part a: which of the following describes the electric field inside this conductor? it is in the same direction as the original external field.it is in the opposite direction from that of the original external field.it has a direction determined entirely by the charge on its surface.it is always zero. part b: the charge density inside the conductor is: 0non-zero; but uniformnon-zero; non-uniforminfinite part c: assume that at some point just outside the surface of the conductor, the electric field has magnitude e and is directed toward the surface of the conductor. what is the charge density η on the surface of the conductor at that point? express your answer in terms of e and ϵ0