# physical science

Popular questions
1. ## physical science

a 30 kg girl and a 25 kg boy face each other on friction-free roller blades.the girl pushes the boy,who moves away at a speed of 1.0 m/s.the girl,s speed is _ m/s.

asked by Anonymous on May 4, 2012
2. ## Physical Science

How many meters away is a cliff if an echo is heard 0.500 s after the original sound? Assume that sound traveled at 343 m/s on that day.

asked by Julie on March 6, 2010
3. ## Physical Science

Two balloons are filled with an equal volume of air. One is put in the refrigerator for one hour, while the other is heated in a slightly warm oven. Identify which balloon is which, and explain why.

asked by Nathan on September 27, 2009
4. ## Physical Science

A rock thrown straight up climbs for 2.50 s,the falls to the ground. Neglecting the air resistance, with wat velocity did the rock strike the ground?

asked by Julie on March 6, 2010
5. ## Physical Science

A 100-g chunk of 72 ∘C iron is dropped into a cavity in a very large block of ice at 0∘C. What is the mass of ice that melts. (The specific heat capacity of iron is 0.11 cal/g⋅∘C.).

asked by Hannah on July 4, 2016
6. ## physical science

The diameter of the sun makes an angle of .53 degrees from earth. How many minutes does it take for the sun to move one solar diameter in an overhead sky? ( Remember that it takes 24 hours or 1440 minutes for the sun to move through 360 degrees). How does

7. ## Physical Science

A force of 400.0N is exerted on a 1,250N car while moving it a distance of 3.0m. How much work is done on the car.

asked by Donna on December 7, 2009
8. ## physical science

What is the kinetic energy of a 29 kg dog that is running at a speed of 8.8 m/s (about 20 mi/h)?

asked by Liz on September 9, 2012
9. ## Physical Science

This is a velocity versus time graph of a car starting from rest. If the area under the line is 10 meters, what is the corresponding time interval? A. 2 seconds B. 4 seconds C. 5 seconds D. 10 seconds E. 15 seconds

asked by Mimic on June 30, 2020
10. ## Physical Science

A van traveling down a slope with a uniform acceleration of 2.15 meters/second^2 attains a speed of 20.00 meters/second after 7.00 seconds. What is the initial velocity of the van? A. 0.00 meters/second B. 3.65 meters/second C. 4.95 meters/second D. 35.05

asked by Mimic on June 30, 2020
11. ## PHYSICAL SCIENCE

A 1.0 kg metal head of a geology hammer strikes a solid rock with a velocity of 5.0 m/s. Assuming all the energy is retained by the hammer head, how much will its temperature increase?

asked by Sarah on November 2, 2007
12. ## physical science

An oceanic depth-sounding vessel surveys the ocean bottom with ultrasonic waves that travel 1530 m/s in seawater. How deep is the water directly below the vessel if the time delay of the echo to the ocean floor and back is 6 s? (sound speed)* (echo time) =

13. ## Physical Science

Which of these cannot increase the strength of an electromagnet? a. making the loops smaller in the coil b. placing an iron bar in the coil c. winding more loops in the coil d. increasing the current in the coil

asked by Alex on April 29, 2014
14. ## Physical Science

A bicycle pump contains 250cm3 of air at a pressure of 90kPa, the volume is reduced to 200cm3. What is the pressure of the air inside the pump? a. 75 kPa b. 220 kPa c. 112.5 kPa d. 240.4 kPa

asked by Ana on July 1, 2020
15. ## Physical Science

A force of 400.0 N is exerted on a 1,250 N car while moving it a distance of 3.0 m. How much work was done on the car?

asked by Misty T on January 29, 2009
16. ## Physical Science

You submerge 100 grams of steel in 200 grams of water. If the steel has an initial temperature of 80°C and the water has an initial temperature of 10°C, what is the final temperature of the system? The specific heat capacity of the steel is 0.15

asked by Connor on October 12, 2012
17. ## physical science

a 5 kg fish swimming at a speed of 1m/s swallows an absent minded 1 kg fish swimming toward it at 4 m/s. the speed of the larger fish after lunch is?

asked by a/p on February 1, 2008
18. ## Physical Science

A car with a mass of 1.1 × 103 kilograms hits a stationary truck with a mass of 2.3 × 103 kilograms from the rear end. The initial velocity of the car is +22.0 meters/second. After the collision the velocity of the car is -11.0 meters/second. What is the

asked by Mimic on July 1, 2020
19. ## Physical Science

Two tugboats are towing a ship. each exerts a horizontal force of 5 tons and the angle between their tow ropes is 90. what net force is exerted on the ship?

asked by Sheryl on September 3, 2011
20. ## Physical Science

A cylinder of acetylene gas is kept at a temperature of 291K. The pressure in the cylinder is 5atm. This cylinder can withstand a pressure of 8atm before it explodes. What is the maximum temperature that the cylinder can safely be stored at ?

asked by Sarah on July 1, 2020
21. ## Physical Science

A bicycle pump contains 250 cm3 of air at a pressure of 90 KPa. If the air is compressed, the volume is reduced to 200 cm3. What is the pressure of the air inside the pump? use p1v1 = p2v2 V1 = 90 and V2 = P1= 250 cm and p9= 200 P1V1 = p2V2 V2=p1V1/p2

asked by Ana on July 1, 2020
22. ## Physical Science

Does this answer look correct? How many gold atoms are in a 1 kg gold bar? The chemical symbol of gold is Au. Consult The Periodic Table in Figure 11.9 on p. 216 in the textbook. Hint: Remember 1u=1.66x10-27kg. 1 mole= 6.022x1023, which is Avogadro’s

asked by JD on April 7, 2020
23. ## Physical Science

A bicycle and its rider together have a mass of 80 kg. If the bicycle's speed is 6m/s, how much force is needed to bring it to a stop in 4 seconds

asked by Jessica on February 1, 2012
24. ## Physical Science

If you know the rate of movement along a fault, the amount of offset over a period of time can be calculated. The basic relationship is Rate = distance/time Movement along the San Andreas Fault is about 3.5 cm/yr. If a fence were built across the fault in

asked by Hannah on April 6, 2017
25. ## Physical Science

Consider three objects: A, B, and C. If A is positively charged, B repels A, and C is attracted by A, what can you say about the charge on B and C? A. B is positively charged and C is negatively charged. B. B is negatively charged and C is positively

asked by Mimic on July 2, 2020
26. ## Physical Science

A penny on its side moving at speed v slides off the horizontal surface of a table a vertical distance y from the floor. If the speed is 3.1 m/s and the coffee table is 0.30 m tall, find the distance the coin lands from the base of the table. (Use

asked by Hannah on June 21, 2016
27. ## physical science

a weightlifter raises a 70 kg barbell from the floor to a height of 2.2m in 1.2s. What was his average power output during the lift?

asked by tracey on September 19, 2012
28. ## Physical Science

A 5.0kg textbook is raised a distance of 30.0cm as a student prepares to leave for school. How much work did the student do on the book?

asked by Misty T on January 29, 2009
29. ## physical science

How much work does gravity do on a 0.140-kg ball falling from a height of 14.0 m? (neglect air resistance)

asked by Liz on September 9, 2012
30. ## Physical Science

A 50.0-kg box is resting on a horizontal floor. A force of 250 N directed at an angle of 26.0° below the horizontal is applied to the box. What is the minimum coefficient of static friction between the box and the surface required for the box to remain

asked by Varusha on February 6, 2017
31. ## Physical Science

Green light has a frequency of about 5.3Hz×1014Hz. Using the relationship c=fλ, find its wavelength in air.

asked by Hannah on July 23, 2016
32. ## Physical Science

The current in a hair dryer measures 15.0 amps. The resistance of the hair dryer is 8 ohms. What is the voltage? A. 120 V B. 0.5 V C. 7 V D. 1800 V I tried this and got D but it was wrong....can I get a little help on how to do this?

asked by Eliza💕 on January 25, 2016
33. ## physical science

On the question...a runner completes exactly 2 laps around a 400 meter track...what is the distance and what is the displacement? Would it be...800m for distance and 0m for displacement? Thanks...

asked by Brandi on August 20, 2014
34. ## Physical Science

C(s) + H2O(g) + Heat CO(g) + H2(g) 17. How would you adjust the temperature to increase the amount of product? 18. Does the removal of hydrogen gas as it is produced shift the reaction to the left or the right? My last two questions on my homework that I

asked by Alexandra on October 11, 2013
35. ## physical science

give one word/term for each of the following descriptions. 1.A substance that donates electrons in chemical reaction. 2.The formula showing the simplest whole number ratio in which the atoms combine to form a compound.

asked by marcia on September 27, 2011
36. ## Physical Science

If you were to expend 10 Joules of work to push a 1-coulomb charge against an electric field, what would be its voltage with respect to its voltage in its starting position? When released, what will be its kinetic energy if it flies past its starting

asked by Christina on September 9, 2009
37. ## Physical Science

The relative atomic mass of a sample of chlorine which contains 75.78% chlorine -35 and 24.22% chlorine-37 is ____.

asked by Maryann on June 25, 2020
38. ## Physical Science

A bicycle pump contains 250 cm3 of air at a pressure of 90 kPa. If the air is compressed, the volume is reduced to 200 cm3. What is the pressure of the air inside the pump? V1 = 90 and V2 = P1= 250 cm and p9= 200 P1V1 = p2V2 V2=p1V1/p2

asked by Nancy on June 11, 2020
39. ## physical science

A clam is dropped by a seagull it takes 3 seconds to hit the ground. what is the seagulls height approximate height above the ground at the time the clam was dropped?

asked by Anonymous on October 17, 2012
40. ## physical science

The heating elements of an electric toaster is typically made of nichrome wire (an alloy of nickel and chromium). As current passes through the wires, the wires heat up, thus toasting the toast. Estimate the overall resistance of a heating element which is

asked by michelle on February 17, 2017
41. ## physical science

. A swimming pool is exactly 20m long, 7m wide, and 2m deep. What is its volume in cubic feet to 3 significant figures?

asked by cathy on July 5, 2012
42. ## Physical Science

Would it be more efficient to warm your bed on a cold night with a hot water bottle that contains 1 kg of water at 50 degrees C or with a 1 kg gold bar at 50 degrees C?

asked by Jackson on September 17, 2011
43. ## physical science

What are the distance and displacement of a race car that completes the Indy 500

asked by rosie on June 15, 2011
44. ## Physical science

In a nucleus of a metal, calculate the electric force of repulsion between two protons, separated by 4x10 m

asked by Bandar on June 14, 2020
45. ## physical science

What length of German silver wire, diameter 0.050 cm, is needed to make a 28 Ωresistor, if the resistivity of German silver is 2.2 × 〖10〗^(-7) Ω m (show work)

asked by michelle on February 17, 2017
46. ## physical science

calculate the mass and volume of oxygen released when 29;4g potassium chlorate decomposes to form potassium chloride and oxygen

asked by asanda on September 30, 2013
47. ## physical science

A person drives a car around a circular cloverleaf with a radius of 58 m at a uniform speed of 10 m/s. ) Compare this answer with the acceleration due to gravity as a percentage

asked by cre on July 12, 2012
48. ## physical science

. Three forces, each 10 lb, act on the same object. What is the maximum total force they can exert on the object? The minimum total force?

asked by sara on July 5, 2012
49. ## Physical Science

​ A 3-kg stone is dropped from a height of 100 m. Find its kinetic and potential energies when it is 50 m from the ground.

asked by Jessica on February 17, 2012
50. ## physical science

A 6 kg bowling ball rolling at 5 m/s strikes a stationary 4 kg bowling ball. If ball #1 is moving forward at 2 m/s after the collision, what is the speed and direction of ball #2? What is the impulse of the system? If the collision last for .5 seconds, how

asked by junior on June 22, 2011
51. ## Physical Science

A 100 kg sample of a metal is cooled from 100°C to 20°C by removing 20 kcal of heat. Calculate the specific heat capacity of the metal.

asked by Anna again...help! on October 12, 2012
52. ## Physical Science

A block of iron is transported to the moon . Which of the following is true 1) Both its mass and weight remain unchanged. 2)Its mass remains the same, but its weight decreases 3)both its mass and weight decreases 4)Its mass decreses, but it weights remain

asked by Archemae on February 21, 2010
53. ## Physical science

asked by ANON on September 1, 2019
54. ## physical science

How much work in N * m is done when a 10.0-N force moves an object 2.5 m? a. 0.25 N*m b. 2.5 N*m c. 25 N*m d. 4.0 N*m please help me thank you so much!!

asked by daniella on May 11, 2018
55. ## Physical Science

The specific heat of copper is 0.385 J/g.°C. Which equation would you use to calculate the amount of heat needed to raise the temperature of 0.75 g of copper from 7°C to 29°C? a. Q = 0.385 J/g.°C ` (29°C 7°C) b. Q = 0.75 g ` 0.385 J/g.°C ` 29°C c.

asked by Alex on May 13, 2014
56. ## Physical Science

How much heat is necessary to change 20 g of ice at 0 degrees C into water at 0 degrees C?

asked by Pam on July 12, 2010
57. ## physical science

. The maximum allowable resistance for an underwater cable is one hundredth of an ohm per metre. If the resistivity of cooper is 1.54 × 〖10〗^(-8) Ω m, find the least diameter of a copper cable that could be used (show work)

asked by michelle on February 17, 2017
58. ## Physical Science

asked by Hannah on June 10, 2016
59. ## Physical Science

A hockey puck moving at 28 m/s is caught by an 80.00 kg man who was at rest. The man and the puck move together after the collision. The pucks mass is 0.16 kg. What is the final velocity?

60. ## Physical Science

Energy from the sun reaches Earth mostly by A. conduction. B. convection. C. radiation. D. thermal expansion. I think it's A.

asked by Danny on September 3, 2013
61. ## physical science

A football player picks up.the football runs with it and throws it to a teammate, during which of these actions is work being done on the football?

asked by kesha on June 30, 2011
62. ## physical science

Suppose you are playing ice hockey in the middle of a totally frictionless frozen pond. How can you move yourself to the edge of the pond? Explain what you would do and why it would work.

asked by kjunior on June 22, 2011
63. ## Physical Science

Rank from largest to smallest atomic radius. To rank items as equivalent, overlap them. O, S, Se, Po, Te

asked by Hannah on January 24, 2017
64. ## Physical Science

Which of the following statements are true about chemical reactions? Check all that apply. A. Reactants are on the right when writing a chemical reaction. B. Products are produced in a reaction. C. Reactants are present at the end of a reaction. D.

asked by jen on January 27, 2015
65. ## Physical Science

The standard unit of length in the metric system is based on what.

asked by Rashida on August 23, 2014
66. ## physical science

How much time is needed for a car to accelerate from 8.0 m/s to speed of 22 m/s if the acceleration is 3.0 m/s^2?

asked by Anonymous on January 29, 2014
67. ## physical science

A screwdriver with a 1-cm shaft and a 4-cm handle is used to tighten a screw, what is the ima?

asked by Liam on April 26, 2011
68. ## PHYSICAL SCIENCE

WHAT IS THE KINETIC ENERGY OF A BALL WITH THE MASS OF 5KG ROLLING AT 10M/S

asked by TRISHA on November 2, 2010
69. ## Physical Science

How much would 80.0 kg person weight (a) on Mars, where the acceleration of gravity is 3.93 m/s2, and (b) on Earth's Moon, where the acceleration of gravity is 4.63 m/s2?

asked by Julie on March 6, 2010
70. ## Physical Science

A bicycle pump contains 250 cm3 of air at a pressure of 90 KPa. If the air is compressed, the volume is reduced to 200 cm3. What is the pressure of the air inside the pump?

asked by Nancy on June 1, 2020
71. ## Physical Science

How much does it cost to operate a 28-W porch light for 24 h if electric energy costs 8¢/ kWh .

asked by Mary on May 2, 2020
72. ## physical science

two cars are headed straight for each other, each at a constant speed of 40mph. A. do the two cars have the same speed? b. do the two cars have the same velocity? c. what is the acceleration of each car while moving at a constant speed

asked by mike on September 18, 2017
73. ## Physical Science

Many people mistakenly believe that the astronauts who orbit Earth are "above gravity." Earth's mass is 6×1024kg, and its radius is 6.38×106m (6380 km). Use the inverse-square law to find a height above Earth's surface at that the force of gravity on a

asked by Hannah on June 21, 2016
74. ## Physical Science

Henry Heavyweight weighs 1200N and stands on a pair of bathroom scales so that one scale reads twice as much as the other. What are the scale reading?

asked by Penny on February 2, 2015
75. ## physical science

need help understanding how to do this problem. "A swimmer swims a half lap, moving from the left end to the right end of a pool that is 50 meters long. What is the distance and what is the displacement? Thanks...

asked by Brandi on August 20, 2014
76. ## Physical Science

Blood is pumped from the heart at a rate of 5L/min into the aorta of radius 2.0cm. Assuming that the density of blood 1x103 kg/m3 .Determine the velocity of blood through the aorta

asked by Janaiby on May 13, 2013
77. ## physical science

the 200g head of a golf club moves 40 m/s in a circular arc of 1.2m radius. How much force must the player exert on the handle of the club to prevent it from flying out of her hands at the bottom of the swing? ignore the mass of the clubs shaft.

asked by tracey on September 14, 2012
78. ## physical science

speed decreases as distance decreases for the same time true or false

asked by donna on June 5, 2012
79. ## physical science

To what Celsius temperature must a gas sample initially at 20 degrees Celsius be heated if its volume is to double while the pressure remains the same?

asked by kristy on May 7, 2012
80. ## Physical Science

A person dives off the edge of a cliff 33m above the surface of the sea below. Assuming that air resistance is negligible, (a) How long does it dive last? (b) and with what speed does the person enter the water?

asked by Jessica on January 29, 2012
81. ## physical science

A satellite that is 4175 miles from the center of the earth, orbits with a period of 90 minutes. What is its centripetal acceleration?

asked by Jay on October 6, 2011
82. ## Physical Science

A force of 10 N is used to lift a 600-g ball from the ground to a height of 1.8 m, when it is let go. What is the speed of the ball when it is let go??

asked by Jason on September 11, 2011
83. ## physical science

A flower pot falls off a window ledge 10.0 m above the ground. Its velocity as it hits the ground is

asked by brittani on June 20, 2011
84. ## physical science

how much sugar is dissolved in 500 grams of a solution if the solution is 70 percent sugar by mass? Also, What is the concentration of a solution that contains 45 grams of sugar in 500 grams of solution? thank you

asked by Lisa on December 28, 2008
85. ## Physical Science

A 0.6-g peanut is burned beneath 50 g of water, which increases in temperature from 22degreesC to 50 degreesc. What is the exact food value of the peanut? (Assuming a 40% efficiency)

asked by Rachel on February 27, 2008
86. ## physical Science

Two people who weigh the same climb a flight of stairs. The first person climbs the stairs in 30 s, while the second person climbs them in 40s. Which person does more work? Which uses more power?

asked by Rachel on February 10, 2008
87. ## Physical Science

If a 1500 kg car is moving 20.0 m/s is brought to a stop by brakes. How many kilocalories of heat are generated in the process? Please include the formula that I should use to find the answer. -Thanks

asked by Sarah on October 26, 2007
88. ## Physical Science

A sample of oxygen gas is at a temperature of 340k and occupies a volume of 1.2cm3. What temperature will the sample of gas be at the volume is decreased to 200cm3?

asked by Anna on May 29, 2020
89. ## Physical science

How many total atoms in (NH4)2cro4

asked by Telayvion on November 20, 2019
90. ## Physical Science

Your glass half full travels across the table at initial speed vi = 2.6 m/sec. Glass and water together add up to a mass of m = 0.22 kg. The underside is wet, so kind of slippery, with frictional force f = 0.29 N retarding the motion.

asked by Cameron Rivera on September 27, 2018
91. ## Physical Science

What is the density of a rectangular block that has a mass of 500g and a volume of 50cm3? what i came up with was 1000. i feel like im wrong though. can anyone please help me.

92. ## Physical science

which liquid evaporates fastest between water , ethanol , nail polish remover and methylated spirits

asked by joy on March 25, 2015
93. ## Physical Science

A sample of gas has its number of molecules halved, its Kelvin temperature doubled, and its volume halved. What is the new pressure, relative to the original pressure?

asked by jasmine on March 17, 2014
94. ## physical science

Consider a 100-kg box of tools in location: A: on Earth B: on the Moon C: on Jupiter. Rank from greatest to the least the a) masses of the 100 kg box of tools and b) the weights of the 100-kg box of tools.

asked by sky on February 9, 2014
95. ## Physical Science

1. Which equation correctly shows beta decay? (A) 210/82 Pb -> 209/81 Tl + 0/-1 e + y (B) 210/82 Pb -> 209/83 Bi + 0/-1 e + y (C) 210/82 Pb -> 210/83 Tl + 0/-1 e + y (D) 210/82 Pb -> 210/83 Bi + y (E) 210/82 Pb -> 210/83 Bi + 0/-1 e + y 2. The half-life if

asked by CJ on November 18, 2013
96. ## Physical Science

A charge of +2 X 10^-7 C is 10 cm from a charge of -6 X 10^-6 C. Find the magnitude and direction of the force of each charge. Could someone help me with this problem. I don't know what to do.

97. ## Physical Science

Ninety kilojoules of heat were added to a 2.0-kg piece of wood whose temperture then rose from 20 degrees Celsius to 48 degrees Celcius. What was the specific heat of the wood?

98. ## Physical Science

A dog having a mass of 32.0 kg runs at a constant pace of 9.50 km/hr. What is the magnitude of the dog's momentum?

asked by Stephy on June 22, 2011
99. ## PHYSICAL SCIENCE

What is happening with parameters(pressure, volume, and temperature)of an air bubble released by a frog at the bottom of a lake and explain why?

asked by ASHLEY on October 5, 2010
100. ## physical science

An 8-kg ball rolling at 2m/s bumps into a pillow and stops in 0.5s (a) Show that the force exerted by the pillow is 32N. (b) How much force does the ball exert on the pillow?

asked by Shevon on November 19, 2008