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A voltage of #180# #V# is placed across a substance. The current begins higher, but as the substance's temperature changes it falls to #6# #A#. What is the resistance of the substance at this point?

How long would it take a 'space elevator' to rise from the earth's surface to a geosynchronous orbit if it could rise at a constant velocity of #3.0# #ms^1#?

How do you solve #\frac { x  10} { 5} =10#?

An apple falls from a tree branch #3.5# #m# high to the ground. What is (a) the velocity of the apple just before it hits the ground and (b) the average force exerted on it by the ground if it decelerates to rest in #0.28# #s#?

(i) What is the velocity of the object just before and just after it collides with the wall. (ii) How far is the original starting point of the object from the wall, and how far from the wall does it travel before stopping after colliding with the wall?

If #g(x)=x3/2#, what is the value of #g(4)#?

Question #acc7b

On a particular surface, the frictional force on a #45# #kg# mass is #60# #N#. What is the frictional coefficient between the block and the surface?

Which places around you form shadows on a clear sunny day?

Ions, periodic table questions.... Please answer if you could?

Jane buys two books for #$72#. One is #3# times the price of the other plus #$4#. What are the prices of the two books?

A rectangular sign is #6# by #4# #m#. A rectangular area on the sign is red, and is #3# by #2# #m#. What percentage of the sign is red?

What is the mass of #3.01xx10^23# molecules of carbon dioxide, #CO_2#?

If I mix #25# #ml# of #0.1# #N# #HCl# with #1000# #mg# of #Mg(OH)_2# in #25# #ml# #H_2O#, what will the resulting pH be?

Calculate how many kilometers light travels in space:
1. in a day?
2. in a week?
3. in a month?

Please answer q 59 and 60?

Dan drove a distance of 260 mi at 65 mi/h. Then he stopped for 30 minutes to have his lunch. After lunch, he covered the rest of his journey at 55 mi/h. If the second part of his journey was 165 mi, how long did he take for the whole journey?

Zach traveled from city A to city B. He left city A at 7:30 a.m. and reached city B at 12 noon. Find his average speed if city B is 180 mi away from city A?

A #5# #L# container holds #8 # mol and #5 # mol of gasses A and B, respectively. Groups of five molecules of gas B bind to two molecules of gas A and the reaction changes the temperature from #100# #K# to #240# #K#. How much does the pressure change?

A force of #50# #N# downward is exerted #2.5# #m# to the left of the fulcrum (hinge point) of a weightless bar. What force must be exerted #4.5# #m# to the right of the fulcrum if the bar is to be balanced?

What does mass defect mean?

Question #7a9f4

A sequence is given by #5, 15, 25, 35, ...# Which term of the series is #145#?

There are 5 people standing in a library. Ricky is 5 times the age of Mickey who is half the age of Laura. Eddie is 30 years younger than double Laura and Mickey's combined ages. Dan is 79 years younger than Ricky. The sum of their ages is 271. Dan's age?

A particular even integer, #n#, and the next even integer after it is less than or equal to the average of that second even integer and the one after *it*, plus #7#. What is the largest integer for which this is true?

How many moles of hydrogen are there in #25.3# #g# of methane, #CH_4#?

A bicyclist of mass #90# #kg# drives around a circle with a centripetal acceleration of #1.5# #ms^2#. What is the centripetal force acting on the bicyclist?

In physics we have studied that work done is independent of the path followed by the body, but in thermodynamics it is said work is path dependent why is this so?

What is the charge on a hydrogen ion?

What are the zeroes of the function #f(x)=2x+4#?

I have heard that speed of sound does not change with change in pressure so why according to formula v equals square root of pressure by density; v is directly proportional to square root of pressure?

If a #9# #kg# object moving at #9# #ms^1# slows down to a halt after moving #81# #m#, what is the coefficient of kinetic friction of the surface that the object was moving over?

A #12# #kg# meteorite is traveling at #550# #ms^1#, and then collides with the ground and comes to rest in #0.22# #m#. What is the average force acting in the object during its deceleration?

What is the difference between a stepup and a stepdown transformer?

A ball with a mass of #6# #kg # and velocity of #4# #ms^1# collides with a second ball with a mass of #3# #kg# and velocity of #5# #ms^1#. If #75%# of the kinetic energy is lost, what are the final velocities of the balls?

An archer fires an arrow at a velocity of #40# #ms^1# and an angle of #45^o# to the horizontal, from a point #1.5# #m# above the ground. Will the arrow reach a tree #400# #m# from the archer?

Mona weighs 423 N on Earth and 1000 N on Jupiter. Find the gravitational force of Jupiter?(take'g'of Earth as 10m/s²)

A #3.0# #kg# bag of potatoes is sitting on top of a spring with a spring constant #k=600# #Nm^1#. (a) What is the compression of the spring at the equilibrium point?

How do you write a balanced nuclear equation for the alpha decay of radioactive isotopes?

Question #8ae30

What is the mass of a single aluminum atom?

What answer do we get when we correctly evaluate this expression? #14.3−2×5^2÷5#

A laser light travels at the speed of light, #300,000# #kms^1#, and has a wavelength of #580# #nm#. What is its frequency?

An object accelerates from rest to #5.9# #ms^1# in #8.5# #s#. How far does it travel in this time?

Question #eac19

Question #e66de

Is my Chemistry teacher wrong or right?

A ball with a mass of #6# #kg # and velocity of #7# #ms^1# collides with a second ball with a mass of #4# #kg# and velocity of # 8# #ms^1#. If #15%# of the kinetic energy is lost, what are the final velocities of the balls?

What element, and how would we write, an atom with 9 protons, 10 neutrons and 10 electrons?

Question #a0669

You are cooking an omelette. An egg (mass 53 grams) slips out of your hand. It hits the ground 0.5 seconds later. From how far up did you drop the egg?

Question #00913

Question #c7a58

How did Ernest Rutherford's alpha particle scattering experiments help him to reject the 'plum pudding' model of the atom and create a more accurate model?

How many disubstituted isomers of benzene are there?

A body is thrown vertically upwards with #55# #ms^1#. What is the distance travelled in the #6th# second?

A #0.473# #kg# object is pushed down #1.087# #m# on a spring with spring constant #K=312.4# #Nm^(1)#. When the spring is released it is shot out at an angle of #49.8^o# to the horizontal. How far does it fly before striking the ground?

The product of 2 and the sum of a number and 10 is at most 8. How do you write this as an equation?

Set #X# = #{1, 2, 3, 4}# and Set #Y# = #{5, 6, 7, 8}#. How would we write the 'union', #nn#, and the 'intersection', #uu#, of #X# and #Y#?

How do you convert #300# #ml# to #m^3#?

How do you simplify #(p^4t^3)/(r^2)#?

What is the mass number of boron?

Puja adds $26 to her savings, then doubles the total, and now has $264. How much did she start with?

Question #cec98

#XCl_3# contains 67.2% chlorine by mass. Calculate the molar mass of X and identity the element.
?

What volume of #0.179# #M# #NaOH# solution contains #25.0# #g# of #NaOH#?

What is the value of #x^2+x2# when #x=2#?

Without using the unit circle, how would I know what angle #tanx1=0# represents?

Question #13bca

In a particular country with a population of #281,421,906#, the annual death rate is #8.7# per #1000# people. How many people die each year in this country?

What is the number represented by the prime factorization: #2^2 * 3 * 5^2#?

Question #6d927

What does the sentence '#10^n# is divisible by #9#' mean?

Question #2236d

How do you write an equation of a line passing through (0, 9), perpendicular to #7x+6y=5#?

What is the SI unit for acceleration?

What is the slope and the yintercept for the line #9y=5x#?

Question #d082e

How do we express #19/25# as a decimal?

A typical sugar cube has an edge length of #1.0 cm#. If you had a cubical box that contained #3.5 "mol"# of sugar cubes, what would its edge length be? (One mole = #6.02 × 10^23# units.)?

Question #41f91

How do we solve this?

What is the equation of a circle, centred on the origin, which passes through the point #(8,3)#?

How do you find the volume of the sphere that has a radius of 1.5 m?

Rearrange the equation #9x8y=16# so that #y# is the subject. What is the solution?

The solid surface area is equal to the solid volume. Find the value of x? The measurements of the rectangular prism is 11 inches long and 3 inches wide. Height is not listed.

How do we solve the quadratic equation #x^2+12x+32=0# to find its two roots?

Circle A has a radius of #5 # and a center of #(2 ,6 )#. Circle B has a radius of #2 # and a center of #(4 ,3 )#. If circle B is translated by #<3 ,2 >#, does it overlap circle A? If not, what is the minimum distance between points on both circles?

One square is twice the size of another (has a side length twice as great). The total of their combined perimeters is #58# units. What are the side lengths of the smaller square?

How do you solve #(2x)/1 = 1/(x1)#?

A force of 75 N at an angle of 15 degrees to the direction of motion moves a chair 3 m. What change would result in more work being done on the chair?

A 1.5 m tall woman throws a tennis ball horizontally. The ball lands 20 m away. What was the initial horizontal velocity of the ball?

How do you solve #3t2=5(t2)2(t4)#?

Kelly is using 3inch square tiles to cover a 4 foot by 2foot area. The tiles are 0.5 inch tall. If the tiles were stacked on top of each other to create a tower, how many inches tall would the tower be?

Anni is an experienced barista who can make a coffee in #20# #s#. Connie is a beginner, so each coffee takes her a minute. On a busy day, how many coffees can they make in total in half an hour, working as fast as they can?

How do you find the zeros of # y = 9/2x^2 + 3/2x – 3/2 # using the quadratic formula?

#(20x)/4+37=4m+n#
# #Is this an equation?

What is the difference between real and imaginary roots?

How do you write the equation of a line in slope intercept, point slope and standard form given P: (3, 4) and Q: (2,1)?

How do you solve the system of equations #3x+y=1# and #y+4=5x# using substitution?

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