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A JNT delivery man is delivering a big box to a client. He is dragging it up a concrete slope leading to the porch, with an angle of 15° to the horizontal. Then he realized that he is on the wrong location so he again dragged the box down the concrete slope. To get the box started up the slope, it is necessary that the man exert six times the force needed to get it started down the slope. If the force is always parallel to the slope, what is the coefficient of static friction between the box and the concrete?
Two small conducting and identical spheres A and B have charges -25 nC and +15 nC, respectively. They are separated by a distance of 0.02 m. (a) What is the magnitude of the electric force between the two spheres? Is this force attractive or repulsive? (b) The spheres are then allowed to touch each other and then separated. What is the magnitude of the force between the two spheres? Is this a repulsive force or an attractive force?
Blue light leaves a Vacuum (the first medium) and enters a second medium. Which of the following second medium will result in the 2nd greatest amount of bending from the original light path?
a. Vacuum
b. Glass
c. Empty space
d. Diamond
e. Air
f. Water
Which of the fulling results when a wave moves from a medium of a low refractive index to a medium of higher refractive index
a. The wavelength increases
b. The wavelength decreases
c. The wave speed increases
d. Its rays bend away from the normal
e. Its rays bend towards the normal
f. Its rays experience are refracted by exactly 90 es
g. Its rays experience Total Internal Reflection
An object of height 19.7 cm is placed 23.6 cm from a convex lens. What is the angular size of this object?
A violet ray of light leaves a first medium at an angle of 0.79 radians to the normal and enters a second medium at 0 56 radians to the normal. Given that the refractive index of the second medium is 1.33. What is the refractive index of the first medium?
If a trolley of mass 5kg moves at 4.m/s east across a frictionless horizontal surface and a box of mass 1,5 kg is dropped onto the trolley then the trolley and the box continues to move in the same direction.calculate the impulse of the trolley.
A machinist wishes to insert a brass rod with a diameter of 2 mm into a hole with a diameter of 1.995 mm. By how much would the machinist have to lower the temperature (in °C) of the rod to make it fit the hole?
A man pulls with a force of 300 N on a rope attached to a
building. The man is positioned 8 m away horizontally and 6
m at the base of the building (vertically) from the point of
attachment, A. What are the horizontal and vertical
components of the force exerted by the rope at point A?
1.The equivalent resistance of two resistors Ri and Rz connected in parallel is given Rey = If R, = 100.0 +5% and R = 47.0 + 5%, find the expected maximum and minimum value of their equivalent resistance when they are connected in parallel.
2. A particle moves in a straight line such that its displacement, x meters, from a fixed point on the line at time t seconds is given by x = 40[e-2t - e-4]. (a) Find the time when the particle is instantaneously at rest. (b) Find the displacement of the particle from O when t = 3 s. (c) Find the total distance travelled during the first 3 seconds of its
