1,302 Answered Questions for the topic physical science
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...
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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?
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?
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?
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...
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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...
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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
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...
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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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Physical Science
03/18/15
Choose the correct answer....
If an object of mass 9 kg has a velocity of 7 m/s what is its linear momentum?
A.) 63 kg-m/s
B.) 1.3 kg-m/s
C.) 0.78 kg-m/s
D.) 16 kg-m/s
E.) cannot be determined
Physical Science
03/18/15
Choose the correct answer....
If the lever arm of a 5-n force is 7 m, what is the torque acting on the object due to this force?
A.) 35 Nm
B.) 0.71 Nm
C.) 1.4 Nm
D.) 12 Nm
E.) cannot be determined
Physical Science
03/18/15
Calculate the centripetal force...
Calculate the centripetal force on a 3.0-kg object moving in a horizontal circular path of 20-m radius with a speed of 8.0 m/s.
Physical Science
03/18/15
What is the unbalanced force acting on the automobile?
An automobile with a mass of 2000 kg is moving north on a level, straight highway with a constant velocity of 80 km/h. What is the unbalanced force acting on the automobile?
Physical Science
03/18/15
Calculate the force.....
Calculate the force on a string tied to a ceiling with a 9.0-kg mass attached.
Physical Science
03/17/15
How much more or less
A small car with a mass of 850 kg travels northward at 29 m/s.
How much less momentum does the car have than the truck when the truck has a mass of 10500 kg and traveling eastward at 19...
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