Recent content by dmolson

Homework Statement The distance between an object and its image is fixed at 40.0 cm. A converging lens of focal length f = 4.2 cm forms a sharp image for two positions of the lens. What is the distance a between these two positions? Homework Equations 1/p + 1/q = 1/f The Attempt at...

Homework Statement An object is placed in front of a convex mirror with a 65 cm radius of curvature. A virtual image half the size of the object is formed. At what distance is the object from the mirror? Homework Equations 1/p + 1/q = 1/f The Attempt at a Solution I have...

I think that it would be parallel so that each light receives the same amount of current, but I am not really sure.

I think that it would be parallel so that each light shines the same brightness, or they all receive the same amount of current, but I wasn't sure.

I know that this is going to sound like a stupid question, but I was wondering if someone could explain the reasoning behind this question. A hanging lamp illuminates a banquet table using 6 light bulbs (120 V). How are the bulbs connected? Series or parallel? Any help would be great.

I know that this is going to sound like a stupid question, but I was wondering if someone could explain the reasoning behind this question. A hanging lamp illuminates a banquet table using 6 light bulbs (120 V). How are the bulbs connected? Series or parallel? Any help would be great.

Homework Statement Q20-9. The power rating of a 1480 W heater specifies the power consumed when the heater is connected to an ac voltage of 120V. What is the power consumed by two of these heaters connected in series, connected to the same voltage? I am a little new to the electricity...

Suppose a 1.68 g nugget of pure gold has zero net charge. What would be its net charge after it has 1% of its electrons removed? Answer in C Mass Electric charge of proton = 1.602e-19 C 1.673e-27 kg...

Homework Statement How many grams of aluminum at 90 C would have to be dropped into a hole in a block of ice at 0 C to melt 20 g of ice. Homework Equations Q = mcdelta T and Q = mLf c(H2O) = 1 cal/g.C c(Al) = 0.215 cal/g.C The Attempt at a Solution I can find the heat of fusion Q...

I cannot figure out how to work this problem out, any help would be great. Thanks in advance.

The pitch of the sound from a racecar engine drops the musical interval of a fourth when it passes the spectators. This means the frequency of the sound after passing is 0.75 times what it was before. How fast is the racecar moving? a. 68 m/s b. 49 m/s c. 61 m/s d. 72 m/s

Determine the final temperature Tf, that results when 77 grams of ice at 0 °C are mixed with 300 grams of liquid water at 50 °C. Specific heat of water: c = 1.00 cal/(gram*°C). Heat of fusion for the ice - liquid water transition: cF = 79.7 cal/gram I have tried this several times and...

A piano string of length 1.6 m and mass density 26 mg/m vibrates at a (fundamental) frequency of 450 Hz. (a) What is the speed of the transverse string waves? (b) What is the tension? c) What are the wavelength and frequency of the sound wave in air produced by vibration of the string...

*have not tried

No, it is part of the e-homework I have. The next part says to calculate the angular frequency. I only have limited tries and I have tried the second part.