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(I) Four point charges are located at the vertices of a square with side L.
We give q2 = q3 = Q and q1= q4 = −2Q.
Determine the resulting electric field (a) at point A,
in the center of the square; (b) at point B
A demonstration Van de Graaff generator has a 15 cm-diameter metal sphere that produces a voltage of 110 kV near its surface (Figure 5). What excess charge resides on the sphere? (k= 9 × 10⁹ Nm²/c²)
a) State Snell’s law in equation form.
b) Light crosses from air to water. The angle of incidence is 750. Draw a schematic diagram of this
event.
c) Calculate the angle of refraction for the event in part b). Take the refractive index of water to be 4/3.
1) A glass window is exactly 20 cm by 30 cm at 10 0C. By how much would its area increase in cm2 when
its temperature is 40 0C? Take the linear expansivity of glass to = 9 X 10-6 / C0.
1) Compare the mercury-in-glass thermometer to the alcohol-in-glass thermometer with respect to: safety,
operating range and sensitivity.
A box with a weight of 1260 N was dragged across the horizontal floor by a man by pulling a rope that is tied on the box. The man exerts a force of F= 485N on the rope, which is inclined at an angle of = 25o and the floor exerts a friction force of 98N on the box.
Find the following:
a. Draw the free-body diagram of the box.
b. The magnitude of the acceleration of the box.
c. Find the coefficient of friction
d. Find the normal force by the floor to the box.
1. An elevator cab that weighs 27.8 kN moves upward. What is the tension in the cable if the cab’s speed is ___.
Find the mass of the elevator:
a. At rest
b. Uniform motion
c. Increasing at a rate of 1.2m/s2
d. Decreasing at the rate of 1.2m/s2
Please give me a solution and formula by letters. Thank you!
A 2.5 KG MASS AND A 4 KG MASS ARE ATTACHED TO A LIGHT
WEIGHT CORD THAT PASSES OVER A FRICTIONLESS PULLEY. THE
HANGING MASSES ARE LEFT FREE TO MOVE. FIND THE
A 5000 KG TRUCK IS RUNNING AT 72 KPH.
a. ) IF IT IS TO BE STOPPED BY A CONSTANT RETARDING
FORCE IN 10 S. WHAT IS THE DECELERATION ?
b ) WHAT IS THE RETARDING FORCE ?
A particle moves in a straight line such that its displacement, x meters, from a fixed point O on the line at time t seconds is given by 𝑥 = 40[𝑒 −2𝑡 − 𝑒 −4𝑡 ].
(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 motion
