Monday

December 22, 2014

December 22, 2014

Number of results: 68,663

**college physics**

a 1.0 N-weight is hanging at rest as shown. In each case, write in the magnitude of the unknown force. a) chain with a weight of 2.5 N has a 1.0 N hanging weight b) chain with a weight of .5 N has a 1.0 N hanging weight c) stretched elastic band with negligible weight has a 1....
*March 8, 2012 by Amber*

**College Physics**

A weight W is now placed on the block and 7.7 N is needed to push them both at constant velocity. What is the weight W of the block? Answer in units of N.
*January 5, 2011 by Olivia*

**statistics**

A nutritionist studying weight gain for college freshmen obtains a sample of n = 20 first year student at the state college. Each student is weighed on the first day of school an again on the last day of the semester. The following scores measure the change in weight, in ...
*June 9, 2013 by Tami*

**College Physics**

As part of a training program, an athlete runs while holding 8.00 weights in each hand. As he runs, the weights swing through a 30.0 arc in . His hands are 72 from his shoulder joint, and they are light enough that we can neglect their weight compared with that of the 8.00 ...
*October 10, 2010 by Matt*

**science**

The mean weight of 500 male students at a certain college is 151 pounds (lb), and the standard deviation is 15 lb. Assuming that the weights are normally distributed, find the probability of students weight (a) between 121 and 155 lb (b) more than 185 lb. c) if 4% of the ...
*February 22, 2013 by suhad*

**Physics **

a 1.0 N-weight is hanging at rest as shown. In each case, write in the magnitude of the unknown force. a) chain with a weight of 2.5 N has a 1.0 N hanging weight b) chain with a weight of .5 N has a 1.0 N hanging weight c) stretched elastic band with negligible weight has a 1....
*March 11, 2012 by Brandon *

**College Physics**

What is the momentum of an automobile (weight = 9700 N) when it is moving at 36 m/s to the south?
*June 15, 2011 by kaleigh*

**physics**

There is a weight on a table, connected by a cord to another weight hanging over a pulley, as shown in the diagram below. The coefficient of kinetic friction for the weight on the table is 0:25. How fast does the hanging weight accelerate? Top weight is 12 kg and bottom is 5kg.
*March 3, 2011 by bill*

**physics**

A 20-lb weight is hung on an 18-in. spring stretching it 6 in. The weight is pulled down 5 in. and 5 lb are added to the weight. If the weight is now released with a downward velocity of y0 in./sec, find the position of mass relative to the equilibrium in terms of y0 and valid...
*November 27, 2010 by Viet*

**college physics**

By immersing a crown in water its volume is 26inc^3=4.2x10^-4m^3. what would its weight be if it were pure gold? What would its weight be if its volume were half gold and half lead?
*October 1, 2012 by tiffany*

**statistics**

You asked ten of your classmates about their weight. On the basis of this information, you stated that the average weight of all students in your university or college is 145 pounds . this is an example of?
*August 29, 2009 by Josephine*

**college**

if an object sinks in a particular fluid,the weight density (weight/volume) of the object will less than, equal to, or greater than, the weight density of the fluid
*February 24, 2010 by tammy*

**College Physics**

What will a spring scale read for the weight of a 73 kg woman in an elevator that moves upward with constant speed of 5.4 m/s?
*February 16, 2010 by Sandy*

**college algebra**

If a 25 lb weight is attatched to a spring how far will it stretch? I got an answer for a 15 lb weight with 8 inches to be 15/8 but when I plug in 15/8 into my new equation it doesn't come up with the right answer.
*April 7, 2014 by candace*

**physics**

There is a weight on a table, connected by a cord to another weight hanging over a pulley, as shown in the diagram below. The coefficient of kinetic friction for the weight on the table is 0:25. How fast does the hanging weight accelerate?
*March 3, 2011 by bill*

**College Physics**

A child swings a yo-yo of weight mg in a horizontal circle so that the cord makes an angle of 30 degrees with the vertical. Find the centripetal acceleration.
*November 10, 2010 by Brianna*

**Physics**

A 30-lb weight is attached to one end of a 6-ft uniform beam whose own weight is 20-lb. Where is the balance point of the system? I know the answer is "1.2 ft from the 30-lb weight" but I can't figure out how to get there. Please help. Thanks...
*April 22, 2011 by Stephanie*

**College Algebra**

Hooke's Law states that the distance a spring stretches is directly proportional to the weight attached to the spring. If a 30-pound weight attached to the spring stretches the spring 8 inches, find how much weight is needed to stretch the spring 12 inches.
*July 10, 2012 by BFG*

**college physics**

Why do the passengers in high- altitude jet planes feel the sensation of weight while passengers in the International Space Station do not?
*October 20, 2013 by bbragg*

**physics**

Estimate the buoyant force that air exerts on you. (To do this, you can estimate your volume by knowing your weight and by assuming that your weight density is a bit less than that of water.) Assume that your weight is a about 1000 N, for example.
*March 28, 2012 by Kristie*

**physics**

Estimate the buoyant force that air exerts on you. (To do this, you can estimate your volume by knowing your weight and by assuming that your weight density is a bit less than that of water.) Assume that your weight is a about 1000 N, for example.
*March 29, 2012 by Jim*

**physics**

Estimate the buoyant force that air exerts on you. (To do this, you can estimate your volume by knowing your weight and by assuming that your weight density is a bit less than that of water.) Assume that your weight is a about 1000 N, for example.
*March 31, 2012 by C*

**physics**

Estimate the buoyant force that air exerts on you. (To do this, you can estimate your volume by knowing your weight and by assuming that your weight density is a bit less than that of water.) Assume that your weight is a about 1000 N, for example.
*April 1, 2012 by christy*

**College Physics**

The four tires of an automobile are inflated to a gauge pressure of 2.0x10^5 Pa. Each tire has an area of 0.024m^2 in contact with the ground. Determine the weight of the automobile.
*October 17, 2010 by Samantha*

**College Physics 2**

a very small ball has a mass of 5 x 10^-3 kg and a charge of 4x10^-6C(microC). What magnitude electric field directed upwad will balance the weight of the ball?
*August 29, 2012 by Mayga*

**Statistics Help !! **

Are my answers here correct ? Research questions for z test, t test for independent samples and t test for dependent samples : z test: "An investigator is interested in finding out whether the particular sample of college students is similar to or different from college ...
*July 14, 2013 by Rey*

**Statistics**

Are my answers here correct ? Research questions for z test, t test for independent samples and t test for dependent samples : z test: "An investigator is interested in finding out whether the particular sample of college students is similar to or different from college ...
*July 16, 2013 by Ira*

**Statistics Help !!!!**

Are my answers here correct ? Research questions for z test, t test for independent samples and t test for dependent samples : z test: "An investigator is interested in finding out whether the particular sample of college students is similar to or different from college ...
*July 19, 2013 by Tise *

**College Physics - Weight**

A planet has a mass of 7.93 × 1023 kg and a radius of 2.58 × 106 m. (a) What is the acceleration due to gravity on this planet? (b) How much would a 67.0-kg person weigh on this planet?
*March 14, 2012 by Anonymous*

**College Algebra and Trigonometry**

A weight is attached to an elastic spring that is suspended from a ceiling. If the weight s pulled 1 inch below its rest position and released its displacement in inches after t seconds is given by x(t)=(5pt+p/3. Find the first two times for which the displacement s 1.5 inches.
*April 30, 2014 by Madlyn Roberts*

**Physics**

the weight of an object changed by =25.0% the object's final weight was 2.5 grams. What is it's inital weight
*March 27, 2011 by Kia*

**College Algebra and Trigonometry **

A weight is attached to an elastic spring that is suspended from a ceiling. If the weight s pulled 1 inch below its rest position and released its displacement in inches after t seconds is given by x(t)=(5pt+p/3. Find the first two times for which the displacement s 1.5 inches...
*April 30, 2014 by Madlyn Roberts*

**College Algebra & Trigonometry**

A weight is attached to an elastic spring that is suspended from a ceiling. If the weight is pulled 1 inch below its rest position and released its displacement in inches after t seconds is given by x(t)=2cos(5ðt+ð/3). Find the first two times for which the displacement s 1.5 ...
*May 2, 2014 by Lira*

**college physics**

This site is just a front for liveperson Most college physics questions are not answered for months if ever. Out of "200 experts" you must have somebody who knows physics right? Guess not.
*September 30, 2009 by john*

**physics**

Ray's weight is 3 times the weight of his sister. His dad weighs twice as much as Ray. Their total weight is 400 pounds. How much does each person weigh?
*March 21, 2011 by Maison*

**physics**

Which is true as one gets closer to the center of the earth? a. The person’s weight increases b. The person’s weight decreases c. The person’s weight remains the same d. The person’s mass changes e. A new dimension is discovered
*May 6, 2010 by jude*

**physics**

How to calculate the force required to move a 6.12Kg weight up a 10degree friction rig? I have done experiments on the friction rig, adding weight until the sliding weight moved, but the calculated results do not match up. Can anyone help?
*February 22, 2014 by daniel*

**PHYSICS thankyou in advance...**

A cake of soap placed in a bathtub of water sinks. The buoyant force on the soap is: a- Zero b- Less than its weight c- Equal to its weight d- More than its weight I believe is D for if the cake of soap sinks, it means that the specific gravity is more than 1, so it is more ...
*April 16, 2011 by DMITRIC*

**physics**

A cake of soap placed in a bathtub of water sinks. The buoyant force on the soap is: a- Zero b- Less than its weight c- Equal to its weight d- More than its weight I believe is D for if the cake of soap sinks, it means that the specific gravity is more than 1, so it is more ...
*April 17, 2011 by DMITRIC*

**Physics**

A Ferris wheel has a circumference of 93 m and it completes one rotation in 2.3 minutes without stopping. What is the percentage change in apparent weight (=weight difference/weight = W/W) of a passenger between the highest and the lowest positions on this Ferris wheel?
*September 21, 2011 by Logan*

**physics**

How can i answer this question ? Two men carry a weight of 800 Newton. The weight is carried by a stick 1 meter long. If the weight is 40 cm from one man, what is the force need to be applied by each man, to keep the stick horizontal?
*August 28, 2012 by Maroa,*

**Physics**

If you are given many closed sacks filled with different amounts of identical marbles, how could you determine the weight of a single marble without opening the sacks? (Assume the weight of the sack material can be ignored.) The only thing I could think of was to weigh the bag...
*January 28, 2010 by Hannah*

**Physics 11th Grade**

Ninja usually weighs 80 kg. He ate 5 kg of cookies over the Holiday Break: a. What is his weight? and B. How can ninja use physics to lose weight?
*January 9, 2011 by Anonymous*

**Physics**

A 4 kg weight falls on a spring that is facing up. The weight compresses the spring 0.25m. If the spring constant of the spring is 3.5N/m, how high was the weight when it was dropped?
*March 19, 2013 by Wilson*

**College Chemistry**

The Water loss by the sample, and the percent by weight of water in the unknown hydrates is 34.78%H2O. which of the ten possible hydrates are the most likely ones to be your unknown based on the percent by weight?
*April 7, 2013 by judy*

**Physics (Please help!!!)**

If you are given many closed sacks filled with different amounts of identical marbles, how could you determine the weight of a single marble without opening the sacks? (Assume the weight of the sack material can be ignored.) The only thing I could think of was to weigh the ...
*January 28, 2010 by Hannah*

**Physics(Please help)**

A paperweight, when weighed in air, has a weight of W = 6.95 N. When completely immersed in water, however, it has a weight of Win water = 4.26 N. Find the volume of the paperweight. Would I multiply the two values of weight and then by the density of water?
*June 20, 2012 by Hannah*

**College Math**

Hooke's Law the table shows the distance D that a spring stretches when a weight W is hung on it. W (pounds 2 6 9 15 D (inches) 1.6 4.8 7.2 12 (a.) Do the data represent direct or inverse variation? Explain. (b.) Find an equation that models the data. (c.) How far will the ...
*April 28, 2011 by Shin*

**Physics**

A vertical spring has one end attached to the ceiling and a 2.50 kg weight attached to the other one. When the system is at rest, the spring is stretched by 20.0 cm. Now let the weight drop from a position in which the spring is not deformed at all.Use the conservation of ...
*June 29, 2011 by Timo*

**College Physics**

Gravity on the surface of the moon is only 1/6 as strong as gravity on the Earth. What is the weight of a 14 kg object on the Earth? The acceleration of gravity is 10m/s2 . Answer in units of N.
*March 2, 2010 by Jennifer*

**Physics**

Take an average 82 kg pet frog, what's it weight on earth? What is it's weight on the moon?
*May 20, 2013 by Mikayla*

**college physics**

"The Magnitude of the buoyant force is equal to the weight of fluid displaced” is a statement of which principle in the study of fluids? Select one: a. Pascal's Principle b. Archimedes' Principle c. Bernouilli’s Principle d. The Equation of Continuity
*June 16, 2014 by allen*

**physics**

Calculate in newtons weight of 2.5kg melon. and what is it's weight in pounds?
*October 28, 2009 by Student*

**Physics/Astronomy**

What would a person's weight be on Mars compared to one's weight on Earth?
*September 14, 2010 by Mike*

**Physics**

A 15 kg uniform disk of radius R = 0.25 m has a string wrapped around it, and a m = 3.3 kg weight is hanging on the string. The system of the weight and disk is released from rest. When the 3.3 kg weight is moving with a speed of 2.1 m/s, what is the kinetic energy of the ...
*March 12, 2012 by Emma*

**physics**

A woman has a mass of 42.9 kg. What is her weight on earth? and what is her weight on the moon, where g=1.17 m/s2
*October 26, 2010 by Jason*

**physics**

The weight of an object changed by +25.0%. The object's final weight was 2.5 grams. What is the initial weight of the object?
*March 28, 2011 by Anonymous*

**physics**

A water bed has dimensions of 1.83mx1.86mx.238m. The floor of the bed room will tolerate an additional weight of no more than 6660N. Find the weight of the water in the bed and determine whether it should be purchased. The weight of the water in the water bed is (volume* g* ...
*April 7, 2007 by CJ*

**physics**

A large, cylindrically-shaped weight is suspended from a long spring found hanging from a rafter. The weight is slender metal cylinder about two meters long that is suspended with its flat bottom about half meter above the level concrete floor. When a 1 kg mass is added, the ...
*December 27, 2011 by sand*

**physics**

An athlete is supporting a weight of 200N in his hand with his forearm at a right angle to his biceps. Assuming his biceps are in the vertical plane, the axis of rotation of the forearm is 3 cm from the elbow and 25 cm from the centre of gravity of the weight, calculate the ...
*February 28, 2012 by alex*

**college physics**

In the drawing, the weight of the block on the table is 478 N and that of the hanging block is 195 N. Ignore all frictional effects, and assuming the pulley to be massless. (a) Find the acceleration of the two blocks. (b) Find the tension in the cord.
*September 20, 2010 by Denise*

**college physics**

find the weight of a piece of wood with a density of .5 g/cm cubed. which when attached to a 5kg stone in water it will sink. the density of the stone is 3g/cm cubed
*June 22, 2010 by josh*

**Physics**

A 30-lb weight is attached to one end of a 6-ft uniform beam whose own weight is 20-lb. Where is the balance point? Thanks in advance.
*April 23, 2011 by Stephanie*

**Physics**

The mass of mars is 6.42 x 10^23 kg and its radius is 3.38 x 10^6m, What is the weight of a 70.0 kg student on this planet? I know weight equals (m)(a) but im not sure how to relate it to the information given
*August 8, 2011 by Tiaanne*

**physics**

If a person has a weight of 145 lb at sea level, by how much is their weight reduced when flying on an airplane at an altitude of 10700 m?
*November 4, 2011 by Anonymous*

**physics**

A sack of flour has weight of 19.8N. what is its weight in pounds?
*September 26, 2012 by rose*

**Physics**

A 10cm times 10cm times 10cm wood block with a density of 700kg/m^{3} floats in water. What is the distance from the top of the block to the water if the water is fresh? weight= density*volume*g weight=700*(0.001)*9.81 weight=6.86newton weight=densitywater*g*10cm*10cm*depth 6....
*November 17, 2009 by ana*

**Physics**

High-heeled shoes can cause tremendous pressure to be applied to the floor. Suppose the radius of a heel is 6.00 10-3 m. At times during a normal walking motion, nearly the entire body weight acts perpendicular to the surface of such a heel. Find the pressure that is applied ...
*April 8, 2007 by Mary*

**PHYSICS HELP**

A 525-N trunk is placed on an inclined plane that forms an angle of 30.0 degrees with the horizontal. What are the components of the weight parallel to the plane and normal to the plane? Memorize this: weight normal = mg cosTheta weight parallel= mg Sin Theta.
*October 16, 2006 by Suzanne*

**College physics**

An airplane is cruising along in a horizontal level flight at a constant velocity, heading due west. (a) If the weight of the plane is 5.54 104 N, what is the net force on the plane? (b) With what force does the air push upward on the plane?
*June 6, 2011 by Amanda*

**Physics**

John's approval rating is an average based upon 4 categories. What is his overall weighted rating if the following is true? Category 1= 450 points weight factor 1 Category 2= 475 points weight factor 2 Category 3= 500 points weight factor 1 Category 4= 400 points weight factor 3
*January 26, 2009 by Sam*

**physics**

Inclined plain-----on Hypotenuse weight of 250 Newton is placed and the base distance is 9 m. What is the minimum force required to lift the weight up?
*January 2, 2012 by Anonymous*

**physics**

A weightlifter is trying to carry a 10 kg weight held over his head across the room. How much energy will be required to do this work on the 10 kg weight?
*May 7, 2012 by Anonymous*

**physics**

A weightlifter is trying to carry a 10 kg weight held over his head across the room. How much energy will be required to do this work on the 10 kg weight?
*May 7, 2012 by Anonymous*

**Chemistry**

I am trying to show that the combined weight of the reactants is equal to the combined weight of the reaction. When I placed CaCl2 into Na2 CO3 I didn't lose any weight. When I added Sulfuric Acid, I could not recork due to safety, therefore I lost Carbon Dioxide which reduced...
*November 1, 2009 by Audra*

**Physics **

f a 40 kg weight and a 200 kg weight each dropped from 1 m above the trampoline, find the final position of each weight. Assume the trampoline is a simple spring obeying Hooke's law with a k value of 12 000 N/m. I was able to get the answer to this, using mg(h+x) = 1/2kx^x but...
*April 18, 2014 by Rose*

**Physics **

A Ferris wheel is 60 meters in diameter and rotates once every 12.5s. what is the ratio of a person's apparent weight to her real weight (a) at the top, and (b) at the bottom?
*October 23, 2013 by Sidney*

**physics**

Describe the difference between the quantities, mass and weight. Give a description of two distinctly different ways in which object's weight can be altered.
*March 14, 2014 by Swastika*

**physics**

an 800 N person stands on a scale in an elevator. What is his apparent weight when the elevator is accelerating upward at 2 m/s^2? B) what5 is his apparent weight when the elevator is acc. downward at 2m/s^2? c) what is his apparent weight when the elevator is moving downward ...
*February 20, 2007 by Sabrina*

**college**

if distance is 59 cm and the weight is 3 kg then what is the distance when the weight is 9 kg
*February 22, 2010 by Anonymous*

**physics**

An astronaut weighs 696 N on the Earth. What is her weight on planet X, which has a radius Rx = Rearth 1.60 and a mass Mx = Mearth 8.60? -the only equation I know for weight is "w = m x g"...I don't know how to solve for w using force.
*January 13, 2008 by Courtney*

**physics**

a uniform meter stick is balanced at its midpoint with a single support. a 50 N weight is suspended at the 30 cm mark. at what point must a 20 N weight be hung to balance the system
*September 16, 2012 by Liz*

**physics**

A child accelerates upwards in an elevator which causes his apparent weight to become 405N. Determine the magnitude of the elevators acceleration if his normal weight is 400N.
*March 29, 2013 by maddi*

**physics**

A weight oscillates in a vertical motion according to the position function y(t)=-5cos t. Assuming t>=0 (greater than or equal to), when will the acceleration of the weight be zero for the first time?
*March 27, 2014 by rachel*

**college**

Calculate the pH of concentrated hydrochloric acid if this solution is 24.8 % HCl by weight and has a density of 1.16 g/mL. a. ) -0.77 b. ) -0.83 c. ) -0.90 d. ) -0.98 e. ) -1.01 i got c
*November 1, 2008 by A.A*

**college**

why a weight reading is considered constant when the last two consecutive weights are within 0.0003g?
*December 8, 2008 by tintin*

**Physics**

You take a ride in a fast elevator to the top of a tall building and ride back down while standing on a bathroom scale. During which parts of the ride will your apparent and real weights be the same? During which parts will your apparent weight be less than your real weight? ...
*January 14, 2013 by Billy*

**algebra**

jill's present weight is 14 pounds less than her weight a year ago. if her weight at the time was 9/8 of her present weight, what is her present weight in pounds?
*October 25, 2010 by Frankie*

**Physics**

as the weight held by a spring increases, the length of the spring increases proportionally. Suppose a 2-lb weight stretches a spring to 15 in., and a 12-lb weight stretches the same spring to 20 in. What is the length of the spring with no weight attached?
*April 2, 2012 by LD*

**College Physics**

As part of an exercise program, a 75 kg person does toe raises in which he raises his entire body weight on the ball of one foot. The Achilles tendon pulls straight upward on the heel bone of his foot. This tendon is 25 cm long and has a cross sectional area of 78 mm^2 and a ...
*October 26, 2007 by Jen*

**Biomechanics**

An 88.9 kg weight lifter is required to perform a snatch movement for their final lift in a weight lifting competition. The standard weight lifting bar is 20 kg and the load attached to the bar was in the form of 6 x 20 kg weight discs, 2 x 10 kg weight discs, 2 x 5 kg weight ...
*May 7, 2012 by Chleo*

**physics**

An object floats with half of its volume beneath the surface of the water. The weight of the displaced water is 2000N. What is the weight of the object? I'm confused by this problem. How would I go about solving this? My guess would be that the weight of the object is 2000N. ...
*December 3, 2007 by Tammy*

**math**

3trucks are equal in weight to 2 trucks and 2 sedans.What fraction of the weight of a truck is the weight of a sedan
*August 5, 2012 by don *

**Physics**

A 20.5 N weight is held in the outstretched hand of a person with a shoulder-to-elbow length of 30.0 cm and an elbow-to-wrist length of 24.0 cm. The center of the weight is 5.5 cm from the person's wrist. Determine the magnitude of the torque about the elbow produced by the ...
*November 8, 2013 by JAYZ*

**11th grade physics**

how high above the surface of the Earth would an object need to be for its weight to be half its weight on the surface?
*November 8, 2010 by Archie*

**Physics**

A weight W is now placed on the block and 7.7 N is needed to push them both at constant velocity. What is the weight W of the block? Answer in units of N.
*January 5, 2011 by Brandon*

**Physics**

If a pointer on a spring scale moves 0.0254 m when a 2.224 N weight is fastened to the hook, the pointer will move how many m when a 17.79 N weight is used?
*March 16, 2011 by Sejul*

**physics**

how high above the surface of the Earth would an object need to be for its weight to be half its weight on the surface?
*November 8, 2010 by Archie*

**physics**

how high above the surface of the Earth would an object need to be for its weight to be half its weight on the surface?
*November 8, 2010 by Archie*

**Physics**

A 10cm times 10cm times 10cm wood block with a density of 700kg/m^{3} floats in water. What is the distance from the top of the block to the water if the water is fresh? weight= density*volume*g weight=700*(10^-3)*9.81 weight=3418.877985 weight=densitywater*g*10cm*10cm*depth ...
*November 16, 2009 by ana*

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