1,308 Answered Questions for the topic physical science

Physical Science Physics Physics C

05/07/15

Balls, balls and shuttlecocks:
 When a ball moves slowly is experiences laminar flow but when it moves fast there is turbulent airflow. What does this mean? What is the Reynolds number? Why are their dimples on a golf ball?… And... more
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Physical Science

04/20/15

How much longer must the minimum length of a plane mirror be for a 6 ft 3 in man to see his complete head-to-toe image than for a 5 ft 4 in woman to do so?
Please help me solve this for physical science. Its about mirrors, lenses, rays, and convexes. 
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Physical Science

04/20/15

How much longer must the minimum length of a plane mirror be for a 6 ft 3 in man to see his complete head-to-toe image than for a 5 ft 4 in woman to do so?
Hi I am an undergraduate student at Louisiana Student University Shreveport, and I am majoring in psychology. 
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Physical Science

04/18/15

Approximate Temperature??
What is the approximate temperature of the Sun at its surface?    ____ K
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Physical Science

04/18/15

Find the distance...
Find the distance in parsecs to Capella, which has an annual parallax of 0.077 arcsec.    ____ pc
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Physical Science

04/18/15

Calculate the period T...
Calculate the period T of a planet whose orbit has a semimajor axis of 2.1 AU.   ____ y
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Physical Science

04/18/15

How many light-years is that?
The famous Pleiades star cluster is about 130 parsecs distant. How many light-years is that?   ____ ly
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Physical Science

04/18/15

What is the parallax of this star?
The red supergiant star in Orion is called Betelgeuse, and its distance is 130 pc. What is the parallax of this star?   ____ arcsec
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Physical Science

04/16/15

How far would the planet be from the sun if...
Asteroids are believed to be material that never collected into a planet. An asteroid has a period of 6.8 years. Assuming the asteroid to be at the center of the planet if it had formed, how far... more
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Physical Science

04/16/15

Calculate the length R...
Calculate the length R of the semimajor axis of a planet whose period is 231 days. ____ AU
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Physical Science

04/16/15

Calculate the period T...
Calculate the period T of a planet whose orbit has a semimajor axis of 2.1 AU. ____ y
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Physical Science

04/01/15

Which car has the greatest kinetic energy?
Car B is traveling twice as fast as car A, but car A has twice the mass of car B. Which car has the greatest kinetic energy and by what factor is it greater?
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Physical Science

04/01/15

Is energy conserved???
A 0.10-kg ball is dropped from a height of 10 m and rebounds to a height of 8.0 m.   a.) Is energy conserved in the ball?   b.) If not, how much energy was lost, and what happened to it?
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Physical Science

04/01/15

How much work can be done?
Given 10 kWh of electricity and assuming no losses, how much work, in joules, could be done?
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Physical Science

03/30/15

What do we pay the electric company for?
What do we pay the electric company for—power or energy? In what units?
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Physical Science

03/30/15

A microwave oven has a power requirement of....
A microwave oven has a power requirement of 1,251 W. A frozen dinner requires 5.4 min to heat on full power. (a) How much electrical energy (in kWh) is used?____ kWh(b) If the cost of electricity... more
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Physical Science

03/30/15

How much does it cost?
On a particular day, the following appliances are used for the times indicated: a 1600-W coffee maker, 16 min, and a 1100-W microwave oven, 3.4 min. With these power requirements, find how much it... more
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Physical Science

03/30/15

How much power in watts....
A 116-lb student races up stairs with a vertical height of 5.7 m in 5.5 s to get to a class on the second floor. How much power in watts does the student expend in doing work against gravity?____ W
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Physical Science

03/30/15

How much time is spent ??
A man pushes a lawn mower on a level lawn with a force of 200 N. If 48% of this force is directed downward, and 66 W of power is expended in pushing the mower 5.0 m, how much time is spent in... more
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Physical Science

03/30/15

An hour later, it is 400 kilometers east and 300 kilometers south of its starting location. Assuming the plane flew in a straight line, how far did it travel?
None  
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Physical Science

03/24/15

What is the speedometer reading of the car?
A 51 kg student traveling in a car with a constant velocity has a kinetic energy of 1.2  104 J. What is the speedometer reading of the car in km/h? ___ km/h
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Physical Science

03/24/15

Kinetic energy question.....
(a) What is the kinetic energy in joules of a 930-kg automobile traveling at 70 km/h?___ J(b) How much work would have to be done to bring a 930-kg automobile traveling at 70 km/h to a stop?___ J
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Physical Science

03/24/15

How much work does gravity do?
How much work does gravity do on a 0.170-kg ball falling from a height of 14.0 m? (Neglect air resistance.)
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Physical Science

03/24/15

How much work is done by the man?
A man pushes a lawn mower on a level lawn with a force of 203 N. If 49% of this force is directed downward, how much work is done by the man in pushing the mower 5.7 m? ____ J
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Physical Science

03/24/15

How much work was done?
A worker pushes horizontally on a large crate with a force of 155 N, and the crate is moved 4.5 m. How much work was done? ___ J
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