Saturday

February 28, 2015

February 28, 2015

Total # Posts: 197

**physics **

hummingbirds beat their wings 1500 times in 30seconds calculate frequency and the period
*January 12, 2015*

**Chemistry**

when electricity is passed through water, the water decomposes into hydrogen gas and oxygen gas. when 10.00 kg of water were decomposed this way, 5788 l of oxygen gas were produced at 25 degrees celsius and 1 atm pressure. what is the percent yield of oxygen by volume?
*November 21, 2014*

**Chemistry**

If the density of ethyl alcohol is 0.789 g/mL, how many quarts can be produced by the fermentation of 100.0 lb of sugar?
*November 3, 2014*

**physics please help**

Two carts with masses of 4.20 kg and 2.44 kg move toward each other on a frictionless track with speeds of 4.92 m/s and 3.87 m/s respectively. The carts stick together after colliding head-on. Find the final speed.
*October 28, 2014*

**Business Statistics**

Customers arrive at a movie theater at the advertised movie time only to find that they have to sit through several previews and prepreview ads before the movie starts. Many complain that the time devoted to previews is too long (The Wall Street Journal, October 12, 2012). A ...
*October 22, 2014*

**science**

please help
*September 24, 2014*

**science**

the neuron that transmit the signal to your foot to kick a soccer ball are called reflexes motor neurons sensory neurons interneurons
*September 24, 2014*

**science**

the neuron that transmit the signal to your foot to kick a soccer ball are called reflexes motor neurons sensory neurons interneurons
*September 24, 2014*

**Chemistry**

hey i have that question too!! is urs on a test by chance??? I'm confused by e
*September 10, 2014*

**chemistry**

If you mix 50 grams of NaHCO3 in 2.0 liters of water, calculate molarity & molality
*June 4, 2014*

**geometry**

My problem is with a parallelogram that has three numbers which are 88 degrees,104,and 80. Then the fourth on is 8x minus 2 how do I slove this
*February 6, 2014*

**Astronomy**

Cheating on the final exam, I see. :P Dont. Try to figure the answer out yourself!
*October 1, 2013*

**Astronomy**

Cheating on the final exam, I see. :P Dont. Try to figure the answer out yourself!
*October 1, 2013*

**math**

suppose that a, b, c ,and d are positive integers whose sum is 100 and a-c=5.What is the greatest possible value of ab-cd answers
*September 6, 2013*

**Math**

PLEASE HELP! Im in 3rd grade!
*April 24, 2013*

**Math**

Stefan drove 558 in 9 hours. He then drove 120 miles in 3 hours. What was Stefan's average speed for the whole trip???
*April 24, 2013*

**social studies**

did germany take over sweden in WW2
*April 14, 2013*

**Alg 1**

2+2
*April 13, 2013*

**physics**

What is the maximum current allowed in a 7.5 W, 300 resistor?
*April 12, 2013*

**health**

Nearly ________ of the heat produced in the body is the result of muscle contraction. A. 55 percent B. 65 percent C. 75 percent D. 85 percent i think its D
*February 13, 2013*

**physics**

Imagine a spring floating in space. This spring has a very small length when it is unstretched. The spring constant for this spring is 4.2 N/m. Now place 2.6 μC charges on each end of the spring, and allow it to stretch until it reaches a new equilibrium. What is the new ...
*February 11, 2013*

**health**

t is recommended that a person ________ to manage and reduce stress. A. Talk to family and friends B. Eat more frequently C. Beat oneself up D. None of the above i think its A
*February 7, 2013*

**health**

oh it would be D
*February 7, 2013*

**health**

You can find ways to manage stress by ________. A. Keeping what’s causing your stress to yourself B. Dismissing any signs of stress C. Pushing yourself to work harder D. Getting active and eating healthy i think its B
*February 7, 2013*

**health**

hat is physical stress? A. A physical reaction of the body to various triggers B. A physical reaction of the mind to various triggers C. A physical reaction of the soul to various triggers D. A physical reaction to the heart to various triggers i think its a
*February 7, 2013*

**health**

thanks
*February 7, 2013*

**health**

Extreme efforts to lose weight among teenagers can lead to ________. A. Obesity related illnesses B. Eating disorders C. More energy D. High self-esteem i think its b
*February 7, 2013*

**health**

thanks agian
*February 7, 2013*

**health**

What type of questions should a patient ask a doctor before getting cosmetic surgery? A. How many years has the doctor performed the surgery B. Who administers the anesthesia C. In which state is the doctor licensed to practice surgery? D. All of the above i think its D but i ...
*February 7, 2013*

**health**

yeah thats what i figured out thank you very much ms sue
*February 7, 2013*

**health**

What can a parent do to help their child develop a positive body image? A. Watch television with their child and discuss the media images that they see B. Criticize the child for what he or she eats C. Force the child to exercise without breaks D. Withhold food from the child ...
*February 7, 2013*

**health**

then it'd be A correct
*February 7, 2013*

**health**

In order to lose weight you have to ________. A. Burn more calories than you consume B. Eat less C. Burn less calories than you consume D. Eat more i think its b
*February 7, 2013*

**health **

thank you
*February 7, 2013*

**helath**

If you’ve decided to lose weight then ________. A. Even modest weight loss can lead to big health benefits B. Modest weight loss can lead to little health benefits C. Large weight loss can lead to little health benefits D. Little weight loss can lead to little health ...
*February 7, 2013*

**physics**

A sonar signal of frequency 1.00 106 Hz has a wavelength of 1.40 mm in water. (a) What is the speed of the signal in water? (b) What is its period in water? (c) What is its period in air?
*February 1, 2013*

**physics**

Water waves in a lake travel 4.5 m in 1.7 s. The period of oscillation is 1.2 s. (a) What is the speed of the water waves? (b) What is their wavelength?
*February 1, 2013*

**physics**

An ocean wave has a length of 12.0 m. A wave passes a fixed location every 2.0 s. What is the speed of the wave?
*February 1, 2013*

**math**

I have rabbits abd chickens. Between them, I count 35 heads. How many rabbits and how many chickens do I have?
*January 31, 2013*

**Math**

if jan has 7 stickers and her brother gives her 6 more how many does she have in total? which double fact can you use to figure out how many stickers she has
*January 30, 2013*

**math**

You have 60 red socks and 30 blue socks unpaired in a drawer. You can not see the socks, they are in a drawer and it is dark. What is the minimum number of socks that you have to pull out before you have a matching pair?
*January 24, 2013*

**economics business studies maths literacy tourism**

What career can i follow in this stream?
*January 24, 2013*

**math asap**

10+3(1+p)=
*January 14, 2013*

**physics**

A 2.2 kg rock initially at rest loses 412 J of potential energy while falling to the ground. Assume that air resistance is negligible. Calculate the kinetic energy that the rock gains while falling. What is the rock's speed just before it strikes the ground?
*January 10, 2013*

**physics**

A 17 kg rock, m, is on the edge of a 105 m cliff, h, as shown in Figure 11-20. Assume that air resistance is negligible. What speed does the rock have as it strikes the ground?
*January 10, 2013*

**physics**

How much potential energy does DeAnna with a mass 57.0 kg, gain when he climbs a gymnasium rope a distance of 3.7 m?
*January 10, 2013*

**math**

What is the least common denominator for the fractions 5/27 and 5/36 ?
*January 2, 2013*

**Physics**

A 0.201-kg plastic ball moves with a velocity of 0.30 m/s. It collides with a second plastic ball of mass 0.105 kg, which is moving along the same line at a speed of 0.10 m/s. After the collision, both balls continue moving in the same, original direction. The speed of the 0....
*December 19, 2012*

**Physics**

Small rockets are used to make tiny adjustments in the speeds of satellites. One such rocket has a thrust of 35 N. If it is fired to change the velocity of a 72100 kg spacecraft by 63 cm/s, how long should it be fired?
*December 19, 2012*

**physics**

A 0.201-kg plastic ball moves with a velocity of 0.30 m/s. It collides with a second plastic ball of mass 0.105 kg, which is moving along the same line at a speed of 0.10 m/s. After the collision, both balls continue moving in the same, original direction. The speed of the 0....
*December 18, 2012*

** asap please **

How many 4/5s are in 1 ? Isn't the answer 5/4 ?
*December 12, 2012*

**math asap **

Rolling a number cube once what is the probability of rolling a number greater than 4 ?
*December 12, 2012*

**math asap**

How many 4/5 are in 1 ? Is the answer 5/4 ?
*December 12, 2012*

**math**

How many 4/5 are in 1 why wouldn't the answer be 5/4 ?
*December 12, 2012*

** math **

Rolling a number cube once what is the Probability of rolling a number greater than 4 ?
*December 12, 2012*

**7 th grade math**

How many 4/5 are in 1 ?
*December 12, 2012*

**math**

(5)(5+5)= I got 25 is it right or is it 50?
*December 12, 2012*

**physics**

A student librarian picks up a 2.2 kg book from the floor to a height of 1.05 m. He carries the book 8.3 m to the stacks and places the book on a shelf that is 0.35 m above the floor. How much work does he do on the book?
*December 11, 2012*

**physics**

A lawn roller is pushed across a lawn by a force of 103 N along the direction of the handle, which is 22.5° above the horizontal. If 63.0 W of power is developed for 90.0 s, what distance is the roller pushed?
*December 11, 2012*

**physics**

A hockey puck has a mass of 0.118 kg and is at rest. A hockey player makes a shot, exerting a constant force of 28.0 N on the puck for 0.16 s. With what speed does it head toward the goal?
*December 11, 2012*

**math**

What fraction = .40625
*December 7, 2012*

**physics**

A 605-kg racing car completes one lap in 14.3 s around a circular track with a radius of 40.0 m. The car moves at constant speed. (a) What is the acceleration of the car? (b) What force must the track exert on the tires to produce this acceleration?
*December 7, 2012*

**math**

If the diameter of a circle is half of a yard then its radius is how many inches?
*December 4, 2012*

**algebra**

using substitution how to solve x + 4y = 8 2x + 5y = 29
*December 3, 2012*

**Physics**

An airplane flies due south at 185 km/h relative to the air. There is a wind blowing at 68 km/h to the east relative to the ground. What are the plane's speed and direction relative to the ground?
*December 3, 2012*

**Physics**

A powerboat heads due northwest at 11 m/s relative to the water across a river that flows due north at 5.4 m/s. What is the velocity (both magnitude and direction) of the motorboat relative to the shore?
*December 3, 2012*

**Math**

A 605-kg racing car completes one lap in 14.3 s around a circular track with a radius of 40.0 m. The car moves at constant speed. a) What is the acceleration of the car? (b) What force must the track exert on the tires to produce this acceleration?
*December 3, 2012*

**math **

What is the rule for this function? Input 1 output 3 Input 2 output 5 Input 4 output 9 Input 5 output 11 Input 10 output 21 Input 12 output 25 Please help thanks
*December 1, 2012*

**math **

What is the rule for this function? Input 1 output 3 Input 2 output 5 Input 4 output 9 Input 5 output 11 Input 10 output 21 Input 12 output 25 Please help thanks
*December 1, 2012*

**7 th grade math**

Input 1 2 4 5 10 12 Output 3 5 9 11 21 25 What is the rule for this function ? If adding add what tried 2 Need help please
*December 1, 2012*

**7 th grade math**

Input 1 2 4 5 10 12 Output 3 5 9 11 21 25 What is the rule for this function ? If adding add what tried 2 Need help please
*December 1, 2012*

**7 th grade math**

What is the rule for this function? input 1 output 3 input 2 output 5 Input 4 output 9 Input 5 output 11 Input 10 output 21 Input 12 output 25 Please help now thanks
*December 1, 2012*

**math**

Input 1 2 4 5 10 12 Output 3 5 9 11 21 25 Write the rule
*December 1, 2012*

**AP Physics**

A curve in a road is banked. There is a car on the curve. What is the component of its weight parallel to the incline? The acceleration of gravity is 9.8 m/s 2 . Answer in units of N Mass of Car: 1.5Mg coefficient of friction: 0.17 theta: 25 degrees
*October 31, 2012*

**physics**

Draw a Force Body Diagram of the block, then write out the sum of the forces equation in both directions. *Frictional Force= coefficient of friction x Normal Force
*October 31, 2012*

**math**

two forces, one of 35 pounds and the other 62 pounds, act upon the same object. The angle between these forces is 25 degrees. Find the magnitude of the resultant force.
*October 29, 2012*

**AP Physics**

To test the performance of its tires, a car travels along a perfectly ﬂat (no banking) circular track of radius 120 m. The car increases its speed at uniform rate of at ≡ d |v| dt = 2.99 m/s 2 until the tires start to skid. If the tires start to skid when the car ...
*October 24, 2012*

**MATH**

WHAT IS THE MEAN 210153420312
*October 20, 2012*

**physics**

A man with a mass of 58 kg stands up in a 69-kg canoe of length 4.0 m floating on water. He walks from a point 0.75 m from the back of the canoe to a point 0.75 m from the front of the canoe. Assume negligible friction between the canoe and the water. How far does the canoe ...
*October 8, 2012*

**AP Physics**

A bullet of mass 0.0022 kg moving at 568 m/s impacts a large ﬁxed block of wood and travels 5.2 cm before coming to rest. Assuming that the deceleration of the bullet is constant, ﬁnd the force exerted by the wood on the bullet. Answer in units of kN Please show ...
*October 2, 2012*

**5th grade math**

what is dis answer
*September 13, 2012*

**AP Physics**

A home run is hit such a way that the baseball just clears a wall 30 m high located 114 m from home plate. The ball is hit at an angle of 37 ◦ to the horizontal, and air resistance is negligible. Assume the ball is hit at a height of 1 m above the ground. Find the speed ...
*September 11, 2012*

**AP Physics**

A parachutist with a camera, both descending at a speed of 9.2 m/s, releases the camera at an altitude of 32.3 m. What is the magitude of the velocity of the camera just before it hits the ground? The acceleration of gravity is 9.8 m/s 2 and air friction is negligible. Answer ...
*September 11, 2012*

**AP Physics**

A ball is thrown horizontally from the top of a building 51 m high. The ball strikes the ground at a point 120 m from the base of the building. The acceleration of gravity is 9.8 m/s 2 Find the x component of its velocity just before it strikes the ground. Answer in units of m...
*September 11, 2012*

**AP PHYSICS**

A quarterback throws the football to a stationary receiver who is 15.2 m down the ﬁeld. The football is thrown at an initial angle of 42◦ to the ground. The acceleration of gravity is 9.81 m/s 2 a) At what initial speed must the quarterback throw the ball for it ...
*September 11, 2012*

**AP Physics**

A baseball is thrown at an angle of 25 ◦ relative to the ground at a speed of 27.6 m/s. The ball is caught 59.4844 m from the thrower. The acceleration due to gravity is 9.81 m/s 2 . How long is it in the air? Answer in units of s
*September 10, 2012*

**AP Physics**

A quarterback throws the football to a stationary receiver who is 15.2 m down the ﬁeld. The football is thrown at an initial angle of 42 ◦ to the ground. The acceleration of gravity is 9.81 m/s 2 . a) At what initial speed must the quarterback throw the ball for ...
*September 5, 2012*

**physics**

A 0.67 kg rock is projected from the edge of the top of a building with an initial velocity of 11.6 m/s at an angle 52 ◦ above the horizontal. Due to gravity, the rock strikes the ground at a horizontal distance of 19.5 m from the base of the building. How tall is the ...
*September 2, 2012*

**PHYSICS**

Assume: A 78 g basketball is launched at an angle of 46.7 ◦ and a distance of 18.6 m from the basketball goal. The ball is released at the same height (ten feet) as the basketball goal’s height. A basketball player tries to make a long jump-shot as described above. ...
*September 2, 2012*

**physics**

A cannon ﬁres a 0.639 kg shell with initial velocity vi = 10 m/s in the direction θ = 55 ◦ above the horizontal. The shell’s trajectory curves downward because of gravity, so at the time t = 0.217 s the shell is below the straight line by some vertical ...
*September 2, 2012*

**physics**

The shell’s trajectory curves downward because of gravity, so at the time t = 0.217 s the shell is below the straight line by some vertical distance ∆h. Find this distance ∆h in the absence of air resistance. The acceleration of gravity is 9.8 m/s 2 . Answer ...
*September 2, 2012*

**books**

"Hi. This is my first time here. Anyway, what do I do to answer this statement?- 'Discuss the the narrator's success in the context of this statement. (Statement: How can a mother's pleas... [Source: The Pact])'"
*July 26, 2012*

**Chemistry**

What is the concentration of the SCN- ion in the stock solution of 2.00 x 10-3 M NaSCN in 0.10M HNO3?
*March 7, 2012*

**chem 2**

a buffer is to be prepared by adding solid sodium acetate to 0.10M CH3COOH. Which othe following concentrations of sodium acetate will produce the most effective buffer? A. 3.0M CH3COONa B 2.5M CH3COONa C 2.0M CH3COONa D 1.5M CH3COONa E .30M CH3COONa HELP
*March 3, 2012*

**college physic**

Liquid helium is stored at its boiling point temperature of 4.2K in a shperical container(r=0.30m).The container is a perfect blackbody radiator.The container is surrounede by a sherical shield whose temperature is 77k.A vacuum exists in the space between the container and the...
*February 22, 2012*

**college physic**

oo thx dude
*February 22, 2012*

**college physic**

Liquid helium is stored at its boiling point temperature of 4.2K in a shperical container(r=0.30m).The container is a perfect blackbody radiator.The container is surrounede by a sherical shield whose temperature is 77k.A vacuum exists in the space between the container and the...
*February 22, 2012*

**college physic**

A solid cylindrical rod made from a center cylinder of lead and an outer concentric jacket of copper.Except for its ends,the rod is insulated,so that the loss of heat from the curved surface is negligible.When a temperature difference is maintained between its ends,this rod ...
*February 22, 2012*

**Half-Life**

Uranium-238 decays to Lead-206. The half life of Uranium-238 is 4.5 billion years. If you have a 100 g sample. How much sample will you have after 2 half lifes?
*February 19, 2012*

**physics**

this didnt work
*February 14, 2012*