Homework Help for Physics

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Physics is the study of matter, motion, energy and force. It is a fundamental science that seeks to understand and explain the universe around us and beyond.

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ivoryoyster898

Lv1

in Physics·

17 Feb 2021

The hill in the picture is 5 meters high, how fast is the hoop traveling at the bottom?

2 answered

Answer

OC user

in Physics·

14 Jan 2018

31.6. A capacitance C and an inductance L are operated at the same angular frequency. (a) At what angular frequency will they have the same reactance? (b) If L = 5.00 mH and C = 3.50 pF, what is the numerical value of the angular frequency in part (a), and what is the reactance of each element?

2 answered

Answer

OC user

in Physics·

12 Jan 2018

Q2.1 Does the speedometer of a car measure speed or velocity? Explain.

4 answered

4 watching

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byzantiumarmadillo356

Lv1

in Physics·

17 Feb 2021

Two point charges are on the y-axis. A 2.5 ÂµC charge is located aty = 1.30 cm, and a -2.46 ÂµC charge is located at y = -1.90cm.
(a) Find the total electric potential at the origin.
(b) Find the total electric potential at the point havingcoordinates (1.50 cm,0).

1 answered

Answer

OC user

in Physics·

10 Jan 2018

5) [8 pts] A friend of yours works in a bar as a bartender, and you decide to improve his life by making his job easier. In particular, he has to take empty beer mugs from the bar and put them in the sink (see the diagram below) - and of course, since students come in after exams for a drink, there are a lot of dirty beer mugs to move. You realize that he could send them sliding down the bar and they would land in the sink if they had the right initial speed. You wonder if you can find a single speed (so that he can easily learn to slide them correctly) for different conditions: in particular, if the bar is clean (larger coefficient of kinetic friction between the mug and the bar), or if there is some beer spilt on it (lower coefficient of kinetic friction). The vertical distance from the bar to the surface of the water in the sink is h=0.65m; the horizontal distances from the edge of the bar to the front and back of the sink are dmin=1.2m and dmax=1.8m. The coefficients of kinetic friction are pk=0.25 for a clean bar, and Uk=0.15 for a bar with beer spilt on it. Your friend stands at a point along the bar which is 5.6m from the edge of the bar, and an empty beer mug has a mass of 0.325kg. a) Find the minimum horizontal speed the mug must have when it leaves the bar so that it lands in the sink (at the near edge). b) Using the speed you found in a), calculate the bartender's "launch speed" (ie, the initial sliding speed) for the high-friction case (Uk=0.25). c) Using the speed you found in b) as the initial sliding speed, analyse the low- friction case: find the speed the mug will have when it leaves the bar, and determine whether it lands in the sink (or hits the far wall and shatters, thus making your friend lose his job). d) [for one extra point) Your bartender friend loves your new system, but the next time you visit him you realize he's still walking over to the sink every time he has a shot glass (a glass that's smaller than a beer mug - it's mass is only 0.125 kg) to put there. Does the mass of the glass matter, or can he launch them at the same speed as the mugs without worry (assume the same coefficients of friction as for the beer mug)? dmax beer mug bar sink

2 answered

Answer

OC user

in Physics·

12 Jan 2018

14.77 • A 5.00-kg partridge is suspended from a pear tree by an ideal spring of negligible mass. When the partridge is pulled down 0.100 m below its equilibrium position and released, it vibrates with a period of 4.20 s. (a) What is its speed as it passes through the equilibrium position? (b) What is its acceleration when it is 0.050 m above the equilibrium position? (c) When it is moving upward, how much time is required for it to move from a point 0.050 m below its equilibrium position to a point 0.050 m above it? (d) The motion of the partridge is stopped, and then it is removed from the spring. How much does the spring shorten?

2 answered

Answer

OC user

in Physics·

11 Jan 2018

2) (10 pts) In the accompanying photo, the images of Sir John A. MacDonald's nose and the Library of Parliament are each twice the size that they appear on the ten-dollar bill, and are at a distance of 3.0 cm from the lens of the magnifying glass. a. Determine the focal length of the lens of the magnifying glass. b. Draw a ray diagram for the system. It does not need to be exactly to scale, but should show the essential features of the system. (Hint: the photo gives you information about the (virtual) image that your eye and the camera see-use this, together with the information given above, to solve the problem). ADA

1 answered

Answer

OC user

in Physics·

9 Jan 2018

5.16 . CP An 8.00-kg block of ice, released from rest at the top of a 1.50-m-long frictionless ramp, slides downhill, reaching a speed of 2.50 m/s at the bottom. (a) What is the angle between the ramp and the horizontal? (b) What would be the speed of the ice at the bottom if the motion were opposed by a constant friction force of 10.0 N parallel to the surface of the ramp?

2 answered

4 watching

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OC user

in Physics·

10 Jan 2018

25.46 " A typical small flashlight contains two batteries, each having an emf of 1.5 V, connected in series with a bulb having resistance 17 1. (a) If the internal resistance of the batteries is negligible, what power is delivered to the bulb? (b) If the batter- ies last for 5.0 h, what is the total energy delivered to the bulb? (c) The resistance of real batteries increases as they run down. If the initial internal resistance is negligible, what is the combined internal resistance of both batteries when the power to the bulb has decreased to half its initial value? (Assume that the resistance of the bulb is constant. Actually, it will change somewhat when the cur- rent through the filament changes, because this changes the temper- ature of the filament and hence the resistivity of the filament wire.)

2 answered

Answer

OC user

in Physics·

9 Jan 2018

25.22. A hollow aluminum cylinder is 2.50 m long and has an inner radius of 2.75 cm and an outer radius of 4.60 cm. Treat each surface (inner, outer, and the two end faces) as an equipotential surface. At room temperature, what will an ohmmeter read if it is connected between (a) the opposite faces and (b) the inner and outer surfaces?

2 answered

Answer

OC user

in Physics·

9 Jan 2018

5.102You are riding in a school bus. As the bus rounds a flat curve at constant speed, a lunch box with mass 0.500 kg, sus- pended from the ceiling of the bus by a string 1.80 m long, is found to hang at rest relative to the bus when the string makes an angle of 30.0° with the vertical. In this position the lunch box is 50.0 m from the curve's center of curvature. What is the speed v of the bus?

2 answered

Answer

OC user

in Physics·

9 Jan 2018

31.45 - In an L-R-C series circuit, R = 3002, Xc = 300 , and X = 500 2. The average electrical power consumed in the resistor is 60.0 W. (a) What is the power factor of the circuit? (b) What is the rms voltage of the source?

2 answered

Answer

OC user

in Physics·

9 Jan 2018

Question Details:

Two identical wheels are moving on horizontal surfaces. the centerof mass of each has the same linear speed. However, one wheel isrolling, while the other is sliding on a frictionless surfacewithout rolling. Each wheel then encounters an incline plane. Onecontinues to roll up the incline, while the other continues toslide up. Eventually they come to a momentary halt, because thegravitational force slows them down. Each wheel is a disk of mass2.0 kg. On the horizontal surfaces the center of mass of each wheelmoves with a linear speed of 6.0 m/s. (a) what is the total kineticenergy of each wheel? (b) Determine the maximum height reached byeach wheel as it moves up the incline.

2 answered

Answer

OC user

in Physics·

8 Jan 2018

28. The anode of an electrolytic cell must be connected to which terminal-positive or negative—of the power source?

2 answered

Answer

OC user

in Physics·

9 Jan 2018

1.55 ... As you eat your way through a bag of chocolate chip cookies, you observe that each cookie is a circular disk with a di- ameter of 8.50 – 0.02 cm and a thickness of 0.050 + 0.005 cm. (a) Find the average volume of a cookie and the uncertainty in the volume. (b) Find the ratio of the diameter to the thickness and the uncertainty in this ratio.

2 answered

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