05/25/16

Heat needed? Energy needed?
a. Calculate the amount of heat needed to warm 24.6 kg of water from a room temperature of 20.0°C to 60.0°C for use in a dishwasher.b. If the water heater has an efficiency of 61%, how much energy... more
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05/25/16

Latent heat of vaporization?
How much more heat is needed to boil 5.0 kg of water than is needed to melt it? The latent heat of vaporization for water is 2260 kJ/kg, and the latent heat of fusion is 333 kJ/kg. 
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05/24/16

Bacteria growth rate question
This stupid calculus problems hate my guts and the growth rate one is giving me trouble here is the question   A bacteria culture grows at a rate proportional to the number 'y' present at any... more
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05/24/16

Calculus Optimization problem
Two numbers have a product of 16. Find these numbers if the sum of their squares is to be a minimum.   The answers are 4 and 4. But i do not how to get them. Please help    Thankyou
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05/24/16

Final temperature?
If 0.20 kg of iron at 100°C is added to 1.00 kg of water at 20.0°C, what is the final temperature of the system?   Please explain
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05/24/16

Oxygen has an atomic number of 8.
Oxygen has an atomic number of 8. What elements would you expect to be most similar to oxygen in terms of its chemical properties?
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05/23/16

Cannonball problem
A cannonball is fired with an initial upward velocity of 100 m/s. The cannonball reaches its highest point halfway between the time it was fired (t=0) and the time it hits the ground. When is it... more
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05/23/16

Magnetic Force
What is the magnetic force on a particle that has –3.2 × 10–19 C of charge and is moving at 2.5 × 107 m/s to the right through a magnetic field that is 0.24 T and pointing away from you? Specify... more
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05/23/16

Power of a light bulb?
What is the power of a light bulb that has a resistance of 144.0 Ω at 120.0 V?
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05/23/16

Electric potential energy? Capacitance?
a. Calculate the electric potential energy stored in a 1.7 × 10–11 F capacitor that stores 3.40 × 10–10 C of charge at 20.0 V.   b. Calculate the capacitance of a system that stores 8.0 × 10–10 C... more
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05/23/16

Electric force?
Calculate the electric force that exists between two objects that are 7.3 × 10–2 m apart and carry charges of 4.5 × 10–6 C and –7.2 × 10–6 C. Is this force attractive or repulsive?
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05/22/16

It takes 12 hours for a certain bacterial culture to double in population
P=P0ert
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05/21/16

You have a string of length L, under tension and held in place at both ends
you have a string of length l under tension and held in place at both ends - measure the frequency of unknown oscillators
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05/21/16

time speed distance
a car travels from p to q at a constant speed if its speed were increased by 10 kmhr it would have taken one hour lesser to cover the distance it would have taken further 45 lesser if the speed was... more
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05/20/16

How much longer would it be fun increase in temperature of 10 degrees Celsius?
Steel expands 1 part in 100,000 for each Celsius degree increase in temperature. Suppose the 1.3 kilometer main span of the Golden Gate Bridge had no Expansion joints. How much longer would it be... more
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05/19/16

The population of a colony of bacteria is growing exponentially according to the function below, where t is the time in hours. How long will it take for the pop
The population of a colony of bacteria is growing exponentially according to the function below, where t is the time in hours. How long will it take for the population of the colony to grow to... more
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05/19/16

find the values of x for which the function has a vertical asymptote
f(x)=(x+2)(x-3)/x(x+6)
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05/19/16

find the values of x for which the function has a vertical asymptote
f(x)=4x/(x+1)(x-1)
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05/19/16

find the values of x for which the function has a vertical asymptote
f(x)=12/(x+8)(x-3)
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05/18/16

Period and speed of pendulum?
The period of motion for a pendulum is the amount of time it takes to swing from right to left and back to right again. The period is given by the equation , where T is the period and L is the... more
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05/18/16

Speed of launcher?
Dwight uses a spring (k = 40 N/m) on a horizontal surface to make a launcher for model cars. The spring is attached to a holder that has a mass of 0.5 kg. If he compresses the spring and releases... more
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05/18/16

Spring Constant? Velocity?
Lincoln goes bungee jumping. He has a mass of 102 kg.a. After his jump, Lincoln hangs from the cord motionless, with the cord stretched by 15 m. What is the spring constant of the bungee cord?b. At... more
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05/17/16

The ratio of carbon-14 to nitrogen-14 in an artifact is 1:3. Given that the half-life of carbon-14 is 5730 years, how old is the artifact? HELP
A. 22,920 yearsB. 17,190 yearsC. 5730 years D. 11,460 years
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05/16/16

When multiplying two matrices does A(B + C) = AB + AC?
When multiplying two matrices does A(B + C) = AB + AC?   yes or no
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05/15/16

Marcy can do a job alone in 5 hrs. If Mark helps her, they can do the job together in 3 hours. How long would Mark take working alone?
Solve this assuming no denominator is zero
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