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Q1. The coefficient of kinetic friction between a 78kg box and a warehouse floor is 0.21. How much force is necessary to keep the box, moving at constant velocity across the floor?
Q2. A particle undergoes a displacement Δr of magnitude 57 m in a direction 25° below the x axis. Express Δr in terms of the unit vectors x and y.
Q3. Consider the vectors in the figure below, in which the magnitudes of A, B, C, and D are respectively given by 57 m, 76 m, 38 m, and 57 m. state the sum, A+ B+ D, in unit vector notation.
Starting from rest, a 4.30-kg block slides 2.00 m down a rough 30.0° incline. Determine the work done by the force of gravity
What is the work done by the tension in the cable.assume the roller coaster (h1 = 34 m, h2 = 13 m, h3 = 30) passes point A with a speed of 3.10 m/s. If the average force of friction is equal to one third of its weight, with what speed will it reach..
A standing wave is created on a string of length 1.0 m and fixed at both ends. What is the wavelength of the third harmonic
A standardized biological microscope has an 8.0--focal-length objective. What focal-length eyepiece should be used to achieve a total magnification of.
If it takes 2.25 minutes to heat water in a 250 gm copper kettle from 20 °C to 85 °C, using a 700 W burner, how much water must be in the kettle
The tortoise can run with a speed of 0.1 m/s and the hare can run with a speed of 2 m/s. They start their race at the same time, but the hare, feeling confident, stops along the way for a two minute nap, and the tortoise wins by the length of his ..
A Proton is located at x=2.0 nm, y=0.0 nm and an electron is located at x=0.0nm, y=4.0 nm. Find the attractive Coulombic force between them
A race car can be slowed with a steady acceleration of -11 m/s2 if the car is going 55m/s how many meters would it travel before it stops?
Illustrate what is the potential energy for the child just as she is released, compared with the potential energy at the bottom of the swing? How much work does the tension in the ropes do as the child swings from the initial position to the bottom?
A man pushing a crate of mass m = 92.0 kg at a speed of v = 0.860 m/s encounters a rough horizontal surface of length scripted l = 0.65 m, Find the net work done on the crate while it is on the rough surface
Capacitors C1 = 6.03 ?F and C2 = 2.45 ?F are charged as a parallel combination across a 298 V battery, Calculate the resulting charge on capacitor C1 and C2
A narrow beam of light is incident normally on one face of equiangular glass prism of RI 1.45. Find the refractive index of this liquid and draw a diagram showing the path of rays
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