PHYSICS HIGH SCHOOL

It takes 56.5 kilojoules of energy to raise the temperature of 150 milliliters of water from 5°C to 95°C. If youuse an electric water heater that is 60% efficient, how many kilojoules of electrical energy will the heater
actually use by the time the water reaches its final temperature?

Answers

Answer 1
Answer: You'd get an extra 40/60 of the energy, or 2/3. Multiply 5/3 by the required energy to get the actual consumption.

Related Questions

Distance measurements based on the speed of light; used for objects in space
If an astronaut weighs 750 N on the ground, what will he weigh in earth orbit 400 km above the earth’s surface? R_earth = 6.38 × 10^6 m, m_earth=5.97×10^24 kgG=6.674×10^−11 Nm^2/kg^2
The two forces in each pair may have different physical origins (for instance, one of the forces could be due to gravity, and its pair force could be due to friction or electric charge). a) Trueb) False
according to newton's second law of motion of the net force acting on the object increases while the mass of the object remains constant, what happens to the acceleration?
a car is moving with a constant speed of 20 meters per second.What total distance does the car travel in 2 minutes

The distribution of total body protein in healthy adult men is approximately Normal, with mean 12.3 kg and standard deviation 0.1 kg. If you take a random sample of 25 healthy adult men, what is the probability that their average total body protein is between 12.25 and 12.35 kg?

Answers

Answer:

P(12.25\leq x \leq 12.35 ) = 0.9876

Explanation:

given,

mean (μ) = 12.3 Kg

standard deviation (σ ) = 0.1

random sample = 25

probability between 12.25 and 12.35 kg

P(12.25\leq x \leq 12.35 ) = P((12.35-12.3)/((0.1)/(√(n)))\leq z)- P((12.25-12.3)/((0.1)/(√(n)))\leq z)

P(12.25\leq x \leq 12.35 ) = P((12.35-12.3)/((0.1)/(√(25)))\leq z)- P((12.25-12.3)/((0.1)/(√(25)))\leq z)

P(12.25\leq x \leq 12.35 ) = P((12.35-12.3)/((0.1)/(5))\leq z)- P((12.25-12.3)/((0.1)/(5))\leq z)

P(12.25\leq x \leq 12.35 ) = P((5 (12.35-12.3))/(0.1)\leq z)- P((5(12.25-12.3))/(0.1)\leq z)

P(12.25\leq x \leq 12.35 ) = P(\frac{2.5\leq z)- P(-2.5\leq z)

using z-table

P(12.25\leq x \leq 12.35 ) = 0.9938 - 0.0062

P(12.25\leq x \leq 12.35 ) = 0.9876

You drop a rock down a well that is 5.4 m deep. How long does it take the rock to hit the bottom of the well?

Answers

Equation of motion:

y_(f)=y_(o)+v_(o)t+ (1)/(2) at^(2)

Since initial velocity is zero, the second term goes away:

y_(f)=y_(o)+0+ (1)/(2) at^(2)

y_(f)=y_(o)+(1)/(2) at^(2)

y_(f)-y_(o)= (1)/(2) at^(2)

y_(f)-y_(o)=5.4m

5.4m= (1)/(2) at^(2)

(2(5.4m) )/(a) = t^(2)

a = g = 9.81 (m)/( s^(2))

(2(5.4m) )/(9.81 (m)/( s^(2) ) ) = t^(2)

1.1 s^(2) = t^(2)\sqrt{1.1 s^(2)} = \sqrt{t^(2)}

t = 1.05s

Answer:

1.05 s

Explanation:

Jason hits a volleyball with an initial velocity of 6 meters per second straight up. if the back starts at 2 meters above the floor how long will the ball be in the air

Answers

Vi = 6 m/s 
d = -2 m 
a = - 9.81 m/s^2 
t = ? 
Formula 
d = vi*t + 1/2 a t^2 
- 2 = 6m/s *t - .5 * 9.81 * t^2 
Put the - 2 on the right. 
4.905 t^2 + 6 m/s t +2 = 0 
 a = -4.905 m/s^2 
b = 6 m/s 
c = 2 m 
t = [- b +/- square root(b^2 - 4ac)]/(2a) 
t = [ -6 +/- square root (6^2 - 4*(-4.905)*2)] / (- 4.905*2) 
t = [-6 +/- 8.674) / - 9.81 
t = -14.674/-9.81 
t = 1.69 seconds. 

Does a light bulb with a greater wattage have a greater brightness

Answers

Only within the same technology. / / / If both of the bulbs you're comparing are incandescent, or both fluorescent, or both CFL, or both LED, then the one that uses more power is brighter. But a CFL with the same brightness as an incandescent bulb uses less power, and an LED bulb with the same brightness as both of those uses less power than either of them.
Yes. If a lamp develops a higher power certainly produce more luminosity, more brightness.

Microorganisms that occur or have adapted to live in a specific environment are called a. fomites. b. droplets. c. pathogen. d. flora.

Answers

The microorganism that occurs or has adapted to live in a specific environment is called D. Flora. Normal Flora or Flora lives inside the body without harming the person.  They are mostly found in the large intestine. I hope you find this helpful.

A very small tilt in Earth’s axis would likely cause ____.

Answers

This would result to small changes in temperature and pressure at various focal pints of the earth relative to the tilt angle. The earth is already at a 23.5 degree tilt angle thus change of this angle would trigger extremities of both high and low temperatures in specific regions.

Answer:

A very small tilt in Earth’s axis would likely cause _____.

 

no climate changes

 

large seasonal variations in temperature

 

short-term climate changes

 

small seasonal variations in temperature

Explanation:

Answer small seasonal variations in temperature

The tilt of Earth’s axis changes by about 3 degrees. This affects the severity of the seasons. When Earth’s axis is less tilted, the temperature difference between summer and winter is less.
Other Questions
What do you call the molten material
The Otto-cycle engine in a Mercedes-Benz SLK230 has a compression ratio of 8.8.Part A. What is the ideal efficiency of the engine? Use γ=1.40.Part B. The engine in a Dodge Viper GT2 has a slightly higher compression ratio of 9.6. How much increase in the ideal efficiency results from this increase in the compression ratio?
A 4.0-kilogram ball moving at 8.0 m/s to the right collides with a 1.0-kilogram ball at rest. After the collision, the 4.0-kilogram ball moves at 4.8 m/s to the right. What is the velocity of the 1-kilogram ball?
If a rod attached to the approaching charge if the rod consists of "stiff" spring-like bonds for which atoms undergo small oscillations. What can we say, about these springlike bonds when the charge is first, furthest away and second, closest to the source charge