Wednesday

April 23, 2014

April 23, 2014

Total # Posts: 45

**Math**

Andie is designing a rectangular play space for her dogs. The length of the play space is 7ft. and the width is 6ft. The new space will have a length and width twice the dimensions of the current space. She needs to purchase sod to cover the ground inside the play space. Write...

**Math**

a number between 1000 and 9999, inclusive, is chosen at random. what is the probability that it contains a)no 9's? b) at least one 9?

**physics**

a double slit located a distance x from a screen, with the distance from the center of the screen given by y. When the distance d between the slits is relatively large, there will be numerous bright spots, called fringes. It can be shown that, for small angles (where sin _...

**physics**

A 2.10 m diameter university communications satellite dish receives TV signals that have a maximum electric field strength (for one channel) of 7.90 µV/m. (a) What is the intensity of this wave? W/m2? (b) What is the power received by the antenna? W? (c) If the orbiting ...

**physics**

On its highest power setting, a microwave oven increases the temperature of 0.350 kg of spaghetti by 45.0°C in 100 s. (a) What was the rate of power absorption by the spaghetti, given its specific heat is 0.900 kcal/kg·°C? W (b) Find the average intensity of the...

**physics**

On its highest power setting, a microwave oven increases the temperature of 0.350 kg of spaghetti by 45.0°C in 100 s. (a) What was the rate of power absorption by the spaghetti, given its specific heat is 0.900 kcal/kg·°C? W (b) Find the average intensity of the...

**physics**

thats 10^13 m2

**physics**

A 2.10 m diameter university communications satellite dish receives TV signals that have a maximum electric field strength (for one channel) of 7.90 µV/m. (a) What is the intensity of this wave? W/m2? (b) What is the power received by the antenna? W? (c) If the orbiting ...

**physics**

how a bleeder resistor (R = 260 k) is used to discharge a capacitor (C = 85.0 µF) after an electronic device is shut off, allowing a person to work on the electronics with less risk of shock. Figure 20.47 (a) What is the time constant? (b) How long will it take to reduc...

**physics**

im still not getting it.

**physics**

Your car's 31.5 W headlight and 2.15 kW starter are ordinarily connected in parallel in a 12.0 V system. What power would one headlight and the starter consume if connected in series to a 12.0 V battery? (Neglect any other resistance in the circuit and any change in resist...

**physics**

(a) What is the resistance of a 120 , a 2.50 k, and a 4.00 k resistor connected in series? (b) What is the resistance if they are connected in parallel?

**physics**

(a) A defibrillator passes 11.0 A of current through the torso of a person for 0.0300 s. How much charge moves? C (b) How many electrons pass through the wires connected to the patient? electrons

**physics**

In open heart surgery a much smaller amount of energy will defibrillate the heart. (a) What voltage is applied to the 5.00 µF capacitor of a heart defibrillator that stores 35.0 J of energy? kV (b) Find the amount of stored charge. mC

**physics**

610 C passes through a flashlight in 0.510 h. What is the average current?

**physics**

A 1.50-V battery supplies 0.244 W of power to a small flashlight. If the battery moves 2.53 1020 electrons between its terminals during the time the flashlight is in operation, how long was the flashlight used?

**physics**

What voltage is applied to the 5.00 µF capacitor of a heart defibrillator that stores 35.0 J of energy? In kv.

**physics**

In nuclear fission, a nucleus splits roughly in half. (a) What is the potential 4.00 10-14 m from a fragment that has 58 protons in it? (b) What is the potential energy in MeV of a similarly charged fragment at this distance?

**physics**

In nuclear fission, a nucleus splits roughly in half. (a) What is the potential 4.00 10-14 m from a fragment that has 58 protons in it? (b) What is the potential energy in MeV of a similarly charged fragment at this distance?

**physics**

The voltage across a membrane forming a cell wall is 80.0 mV and the membrane is 8.80 nm thick. What is the electric field strength? (The value is surprisingly large, but correct. Membranes are discussed in Section 19.7* of the textbook.) You may assume a uniform E-field.

**physics**

The voltage across a membrane forming a cell wall is 80.0 mV and the membrane is 8.80 nm thick. What is the electric field strength? (The value is surprisingly large, but correct. Membranes are discussed in Section 19.7* of the textbook.) You may assume a uniform E-field.

**physics**

The voltage across a membrane forming a cell wall is 80.0 mV and the membrane is 8.80 nm thick. What is the electric field strength? (The value is surprisingly large, but correct. Membranes are discussed in Section 19.7* of the textbook.) You may assume a uniform E-field.

**physics**

If an electron travels 0.250 m from an electron gun to a TV screen in 32.0 ns, what voltage was used to accelerate it? (Note that the voltage you obtain here is lower than actually used in TVs to avoid the necessity of relativistic corrections.)

**physics**

What magnitude point charge creates a 13000 N/C electric field at a distance of 0.220 m?

**physics**

A 52.0 g ball of copper has a net charge of 2.1 µC. What fraction of the copper's electrons have been removed? (Each copper atom has 29 protons, and copper has an atomic mass of 63.5.)

**physics**

A particular trophy has a solid 0.2m radius base with a mass of 1.2kg. Rising up from the center is a 0.01m radius solid rod with a mass of 0.4kg. Centered on top of this is a hollow sphere with a radius of 0.15m and a mass of 0.8kg. Calculate the total moment of inertia for t...

**physicss**

A 0.005kg bullet is fired at 400m/s straight into a stationary 1.0kg block of wood. The bullet exits the far side of the block and continues on the same straight line. The block also moves off in this same direction with a velocity of 1.2m/s. Calculate the velocity of the bull...

**physics**

A 0.005kg bullet is fired at 400m/s straight into a stationary 1.0kg block of wood. The bullet exits the far side of the block and continues on the same straight line. The block also moves off in this same direction with a velocity of 1.2m/s. Calculate the velocity of the bull...

**physics**

While sitting on a frozen pond, a 35kg child throws a 0.5kg ball horizontally at a velocity of +6m/s. Calculate the resulting velocity of the child across the ice.Suppose the child throws the ball upward instead, at a 25o angle above horizontal. a) Calculate the resulting velo...

**physics**

A 0.1kg ball dropped on the floor hits with a speed of 4.0m/s and rebounds at a speed of 3.8m/s. Calculate the impulse delivered to the ball by the floor.

**physics**

A 52kg teen grabs onto a rope swing. The length of rope between the teen and the pivot point above is 4.5m, and the rope makes an angle of 40o relative to vertical. Calculate his change in potential energy as he swings down and out to the point where the rope is in the vertica...

**physics**

Hans stands at the rim of the Grand Canyon & yodels down to the the bottom. He hears his yodel echo back from the canyon floor 5.20 seconds later. Assume that the speed of sound in air is 340 m/s. How deep is the canyon?

**Math**

Three(cylindrical) steel drums are put together and a steel band is wrapped tightly around the three drums. If the radius of each drum is 2 feet, what is the length of the steel band? (The view of the drums below is from the top, or end of the drums.) The three drums are in a ...

**human anatomy **

one day, at the high jump mat, Lucy,a 4'4 jumper, asks Georgina, a 5' jumper."When running here,breathing doesn't really count right? I mean we're only going less than 50 meters. What difference does it make if we hold our breath?" Georgina sighs and ...

**Calculus**

Could someone please help me solve this If f(2)=f'(2)=g'(2)=g(2)=2, find (fg)'(2). How would I solve this, I am completely lost as to what I would do.

**Pre-Calculus**

How do I find xy^-2(xy^2 - 4y^4) ??

**statistics**

2) Two individuals are running for mayor of Tallahassee. You conduct an election survey (N = 561) a week before the election and find that 57% of the respondents prefer candidate A. Can you predict the winner (α = 0.01)? (Hint: Use 50% as the proportion of votes needed fo...

**10th grade Literature**

Ok, I have to answer questions on these 2 poems, and I can't figure them out... The Golf Links Lie So Near The Mill by Sarah N. Cleghorn The golf links lie so near the mill That almost every day The working children can look out And see the men at play. And the 2nd... Eart...

**music**

thank you :)

**music**

How was the music of the 1960's different from the music of the 1970's?

**statistics**

A population forms a normal distribution with a mean of sigma=75 and a standard deviation of 20. - What proportion of the sample means for samples of n=25 have vales less than 80? In other words, find p(M>79) for n=25 - What proportion of the sample means for n=100 have val...

**Physics**

A harmonic wave is traveling along a rope. The oscillator that generates the wave completes 40.0 vibrations in 27.0 s. A given maximum of the wave travels 455 cm along the rope in a time period of 10.0 s. What is the wavelength?

**Physical Science**

A donkey pulls a cart(c) with a mass of 240kg, attached to a log of wood(w), with a mass of 80kg on a horizontal road. W is tied to the back of c by means of non elastic rope. The donkey applies a foce of 170N on Cart c and the system accelerates at 0,3m s-2 to the left. The f...

**science**

I have a beak like a bird And my arms are like snakes I hav more ink than a pen But I write to confuse What am I What animal has arms (or legs) that are like snakes? Look to the water. Although I haven't solved the riddle for you, I hope the additional hint might help. Tha...

**Science**

i dont know either my science teacher mr.radeke has know clue either!

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