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Posts by Mohanad

Total # Posts: 34

physics
how many gram of ice at 0 c can be melted by the heat released when one gram of steam condense to water at 100 c check my answer please and you deman i am sorry by accident i post it the previous question solution Qcold=-Qhot MLf(ice)=-MlV(water) Mice = -(-0.001*2256000)/(...

physics
how many gram of ice at 0 c can be melted by the heat released when one gram of steam condense to water at 100 c

physics
Indigenous people sometimes cook in watertight baskets by placing hot rocks into water to bring it to a boil. What mass of 500ºC rock must be placed in 4.00 kg of 15.0ºC water to bring its temperature to 100ºC , if 0.0250 kg of water escapes as vapor from the ...

physics
If you pour 0.0100 kg of 20.0ºC water onto a 1.20-kg block of ice (which is initially at −15.0ºC ), what is the final temperature? You may assume that the water cools so rapidly that effects of the surroundings are negligible.

physics
A 0.250-kg aluminum bowl holding 0.800 kg of soup at 25.0ºC is placed in a freezer. What is the final temperature if 377 kJ of energy is transferred from the bowl and soup, assuming the soup’s thermal properties are the same as that of water?

physics
How many grams of coffee must evaporate from 350 g of coffee in a 100-g glass cup to cool the coffee from 95.0ºC to 45.0ºC ? You may assume the coffee has the same thermal properties as water and that the average heat of vaporization is 2340 kJ/kg (560 cal/g). (You ...

physics
a cylinder with movable piston contains 40 moles of an ideal gas it is placed in an ice water bath where it reach thermal equilibrium. it is then compressed slowly with 7500 j of work done to compress it to a smaller volume. how much does its internal energy change

physics
if an ideal gas expands rapidly doing work 450 j of work on its environment, how much heat flowed into or out of it

physics
When heat transfers into a system, is the energy stored as heat? Explain briefly.

physics
Putting a lid on a boiling pot greatly reduces the heat transfer necessary to keep it boiling. Explain why

physics
Assuming bicycle tires are perfectly flexible and support the weight of bicycle and rider by pressure alone, calculate the total area of the tires in contact with the ground. The bicycle plus rider has a mass of 80.0 kg, and the gauge pressure in the tires is 3.50×105 Pa

physics
Water towers store water above the level of consumers for times of heavy use, eliminating the need for high-speed pumps. How high above a user must the water level be to create a gauge pressure of 3.00×105 N/m2 ?

physics
A submarine is stranded on the bottom of the ocean with its hatch 25.0 m below the surface. Calculate the force needed to open the hatch from the inside, given it is circular and 0.450 m in diameter. Air pressure inside the submarine is 1.00 atm.

physics
pressure cookers have been around for more than 30 years, although their use has stongly declined in recent years.how much force must the latches holding the lid onto pressure cooker be able to withstand if the circular lid is 25 cm in diameter and the gauge pressure inside is...

physics
A certain hydraulic system is designed to exert a force 100 times as large as the one put into it. (a) What must be the ratio of the area of the slave cylinder to the area of the master cylinder? (b) What must be the ratio of their diameters? (c) By what factor is the distance...

chemistry
no thing given rather then this information and this is exam question how i can look for ionization energy?

chemistry
List the following in order of increasing force of attraction 1. an electron in the outer shell of carbon atom (in the ground state level) 1.1*10^(-10)m a part from nucleus. 2.an electron in the outer shell of oxegen atom (in the ground state level) 9.0*10^(-11)m a part from ...

college physics
A 0.240-kg billiard ball that is moving at 3.00 m/s strikes the bumper of a pool table and bounces straight back at 2.40 m/s (80% of its original speed). The collision lasts 0.0150 s. (a) Calculate the average force exerted on the ball by the bumper. (b) How much kinetic ...

college physics
Competitive divers pull their limbs in and curl up their bodies when they do flips. Just before entering the water, they fully extend their limbs to enter straight down. Explain the effect of both actions on their angular velocities. Also explain the effect on their angular ...

physics
What force should the woman in Figure 9.45 exert on the floor with each hand to do a push-up? Assume that she moves up at a constant speed.

college physics
During a circus act, an elderly performer thrills the crowd by catching a cannon ball shot at him. The cannon ball has a mass of 10.0 kg and the horizontal component of its velocity is 8.00 m/s when the 65.0-kg performer catches it. If the performer is on nearly frictionless ...

physics
during a circus act, an elderly performer thrills the crowd by catching a cannon ball shot at him the ball mass is 10.0 kg and ball velocity is 8 m/s while the performer mass is 65 kg. if the performer is on nearly friction-less roller skates, what is his recoil velocity.

physics
train car are coupled together by being bumped into one another. suppose two loaded train cars are moving toward one another, the first having a mass of 150000 kg and velocity of 0.30 m/sand the second havin a mass of 110000 kg and a velocity of (-0.12 m/s). what is their ...

physics
A 2400 kg car moving at 11 m/s crashes into a tree and stops in 0.26 s. calculate the force the seat belt exerts on passenger in the car to bring him to a halt the mass of the passenger is 72 kg.

chemistry
A 125.0 mg sample of an unknown, monoprotic acid was dissolved in 100.0 mL of distilled water and titrated with a 0.050 M solution of NaOH. The pH of the solution was monitored throughout the titration, and the following data were collected. Determine the Ka of the acid. ...

physics
A shopper pushes a grocery cart 20.0 m at constant speed on level ground, against a 35.0 N frictional force. He pushes in a direction 25.0º below the horizontal. (a) What is the work done on the cart by friction? (b) What is the work done on the cart by the gravitational ...

physics
calculate the work done on a 1550kg elevator car by its cable to lift it 40 m at constant speed assuming friction average 125 n

physics
astronomical observations of our milky way galaxy indicate that it has a mass about 8.0 *10^13 times the mass of our sun. a star orbiting on the galaxy edge is about 6.0*10^4 light years a way from the galactic center what is the orbital period of that star in earth year

chemistry
How much 6.0M NaoH must be added to 0.5L of a buffer that is 0.0200M acetic acid and 0.0250M sodium acetate to raise the PH to 5.75

general chemistry
How much 6.0M NaoH must be added to 0.5L of a buffer that is 0.0200M acetic acid and 0.0250M sodium acetate to raise the PH to 5.75

Physics
Two children pull a third child on a snow saucer sled exerting forces F1 and F2 as shown from above in Figure 4.36. Find the acceleration of the 49.00-kg sled and child system. Note that the direction of the frictional force is unspecified; it will be in the opposite direction...

Math
One half the distance from Boston to New York minus 25

algebra
One half the distance from Boston to New York minus 25

Physics
F=P*A A= Pi*r^2 A=Pi*(25/2)^2 A=0.04909 cm^2 Pgauge=Pabs- 1 atm p abs =P gauge+1 P abs= 4 atm F= (0.04909 cm^2 * (1m^2)/(100cm)^2)*(4 atm*1.013*10^5 N/m^2) F=1.99 N

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