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Question1
Alan leaves University of lethbridge at 8:00am to drive to AU, 650 km away. He leaves at an average speed of 100km/h. Beth leaves Lethbridge at 9:00am and drives to AU at steady speed of 120 km/h. what is right? a) alan arrives first and has to wait 1 hour for beth
b) alan arrives first and has to wait approx. 5 minutes for beth
c) alan arrives at the similar time as beth
d) beth arrives first and waits approx. 5 minutes for alan
e) beth arrives first and waits 1 hour and 5 minutes for alan
Question2
(a)considering that coefficient of kinetic friction between rubber and dry concrete is 0.8, calculate the maximum acceleration that a car can safely have on a concrete road?
(b) Coefficient of kinetic friction for rubber on dry asphalt is 0.5. What is utmost acceleration that a car can have on this surface?
(c) Which is safer as a road material: concrete or asphalt?
An extension cord made of two wires of diameter 0.129 {rm cm} (no. 16 copper wire) and of length 1.5 m (5 ft) is connected to an electric heater which draws 13.5 A on a 120-{rm V} line. How much power is dissipated in the cord.
Photorefractive keratectomy (PRK) is a laser-based surgery process that corrects near- and farsightedness by removing part of the lens of the eye to change its curvature and hence focal length. What is the energy of a single photon
You want to take a full-length photo of your friend who is 2.00m tall, using a 35.0mm camera having a 50.0mm lens. How far should your friend stand from the lens
A 30-g silver teaspoon at room temperature 200C is placed into 200 g of hot tea 1000C. No heat escapes the spoon-tea system. You assume that the specic heat of tea is the same as that of water.
A small rubber wheel on the shaft of a bicycle generator presses against the bike tire, What is the peak emf produced by the generator at the end of 4.64 s
An object in the shape square with a circle cut in the center of it spins about it ceter of mass. what is moment of inertia in terms of M and R
When an 82.0-kg adult uses a spiral staircase to climb to the second floor of his house, his gravitational potential energy increases by 2 x 10^3 J. By how much does the potential energy of a 17 kg child increase when the child climbs a normal sta..
A sound wave of frequency 171 Hz has an intensity of 3.29 ?W/m2. What is the amplitude of the air oscillations caused by this wave
(1) A circular wheel has a radius R = 0.45 + or - 0.02 m. The wheel is observed to be rotating uniformly with period T = 2.00 +or- 0.05 s. (i) Compute the frequency with which the wheel spins (ii) Compute the angular speed of the wheel. (iii) Comp..
You have a grindstone ( a disk) that is 80.0 kg, has a .349-m radius, and is turning at 104.0 rpm, Calculate the angular acceleration of the grindstone
a. calculte the potential difference between the conductors if they are sperated by a distance of 2m (use x=0 as the v=0 reference point.) b. how much energy is gained by a 20uc charge
A flat, uniform, circular disk (R = 2.25 m, m = 84.0 kg) is initially at rest, but it is free to rotate in the horizontal plane about a vertical, Find the resulting angular velocity of the disk
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