4,374 Answered Questions for the topic Science

Science Math Physics

11/07/20

What is the appropriate equation?

My college’s average electric power consumption is about 2 MW. What area of 15%-efficient photovoltaic modules would be needed to supply this much power during a summer month when... more
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11/06/20

How far does the jet travel during the 7 s?
A jet aircraft with a mass of 4,400 kg has an engine that exerts a force (thrust) equal to 60,200 N.What is the jet's acceleration when it takes off? (Give the magnitude.)What is the jet's speed... more
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11/06/20

What is the size of the force when it is at each of the following distances from Earth's center?
A space probe is launched from Earth headed for deep space. At a distance of 10,000 miles from Earth's center, the gravitational force on it is 457 lb. What is the size of the force when it is at... more
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11/06/20

What is it in g's?
A race car rounds a curve at 53 m/s. The radius of the curve is 405 m, and the car's mass is 670 kg. (Assume the car's speed remains constant. Take the radially inward direction to be positive.... more
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11/06/20

What speed limit should be posted for the curve so that cars can negotiate it safely?
On a highway curve with radius 44 m, the maximum force of static friction (centripetal force) that can act on a 1,373-kg car going around the curve is 8,127 N. What speed limit should be posted for... more
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11/06/20

How large is the force that the catapult must exert on the jet?
On aircraft carriers, catapults are used to accelerate jet aircraft to flight speeds in a short distance. One such catapult takes a 17,600-kg jet from 0 to 68 m/s in 2.6 s. (Assume the catapult... more
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11/06/20

What is the acceleration of the jet in g's?
On aircraft carriers, catapults are used to accelerate jet aircraft to flight speeds in a short distance. One such catapult takes a 17,600-kg jet from 0 to 68 m/s in 2.6 s. (Assume the catapult... more
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11/06/20

What does the scale read?
A person stands on a scale inside an elevator at rest (see the figure below). The scale reads W = 752 N.What is the person's mass?The elevator accelerates upward momentarily at the rate... more
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Science Math Chemistry

11/06/20

I need help with this chemistry problem. Please explain your answers if it isn't too much trouble
Intravenous infusions are often made under gravity as shown below. Assuming the density ofthe fluid is 1.00g/cm3 at what height h should the bottle be placed so the liquid pressure is(a) 55... more
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Science Math Chemistry

11/06/20

I need help with this chemistry problem, please explain your answers if it isn't too much trouble.
3. The diagrams below represent equal volumes of four different gases. Use the diagrams toanswer the following questions:a. Are these gases at the same temperature and pressure? How do you know?b.... more
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Science Math Chemistry

11/06/20

I need help with this chemistry question, please explain your answers if it isn't too much trouble.
The methane CH4 of 29.0 L undergoes complete combustion at 0.961 atm and 140 C.a. Write down the balanced equation of the chemical reaction producing carbon dioxideand water vapor.b. How many... more
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Science Math Chemistry

11/06/20

Please show me how to do this chemistry problem, explain your work if you don't mind.
The size of our chemistry classroom is approximately 10 m x 10 m x 3 m.(a.) What is molar mass of air filling our classroom assuming that air is composed of 20 %oxygen (O 2 ) and 80 % nitrogen (N 2... more
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11/06/20

Physics - Rotation
Two ice skaters are holding opposite sides of a large, very flexible spring. When they are 1 m apart they are turning in a circle at about 2 Hz (cycles/s). If, while turning, they stretched their... more
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11/05/20

Calculate the final angular velocity
A cylinder with moment of inertia 12.9 kg m2 rotates with angular velocity 2.03 rad/s on a frictionless vertical axle. A second cylinder, with moment of inertia 30.3 kg m2, initially not rotating,... more
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Science Math Physics Algebra

11/05/20

What is the object's mass?
In an experiment performed in a space station, a force of 51 N causes an object to have an acceleration equal to 6 m/s2. What is the object's mass?
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11/05/20

Is this sentence correct ?
If you decrease the risk of a type I error, the risk of a type II error is increased
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11/05/20

Which of the following about isoenzymes are true ?
A.) They have the same primary sequenceB.) They localise in different tissuesC.) Isoenzymes have different isoelectric pointsD.) They remain unaltered in health and diseasesI believe the answer is... more
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11/05/20

Can you please quickly help me?
Question: What is biomarker?A.) A biological therapy for a diseaseB.) A measurable characteristic by which presence or severity of a disease can be indicatedC.) A symptom of a diseaseD.) A... more
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Science Biology Anatomy

11/05/20

Describe the role of the gametophyte and the sporophyte in the plant reproductive cycle.
Short answer please. (1-3 sentences)Thank you!
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11/05/20

Help!! A high-speed train in Japan travels a distance of 300. kilometers in 3.60 x 103 seconds. What is the average speed of this train? (Turn the time into hours by using a unit conversion)
60 min= 1hr60s= 1min
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Science Chemistry Physics

11/05/20

An object on a number line moved from x= 15 m to x = 165 m all in a time of 100 seconds. a) What was the average speed of the object?
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11/04/20

What is the object's mass?
In an experiment performed in a space station, a force of 51 N causes an object to have an acceleration equal to 6 m/s2. What is the object's mass?
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11/04/20

How fast was the ball traveling when it hit the ground?
For a building having a height equal to the quantity you have recorded for Day in meters (in our example 15 meters), compute the time required for the ball to fall to the ground while experiencing... more
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11/04/20

What is the net force (in N) acting on it? (Enter the magnitude.)
The mass of a subway car and passengers is 37,600 kg. If its acceleration as it leaves a station is 0.8 m/s2, what is the net force (in N) acting on it? (Enter the magnitude.)
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11/04/20

How to find the molar enthapy of Ammonium nitrate?
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