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A radioactive source of a single nuclide emits 2.4-MeV neutrons at the rate of 9200 neutrons per second. The number of atoms in
1. 0 answers
2. 841 views
A radioactive source of a single nuclide emits 2.4-MeV neutrons at the rate of 9200 neutrons per second. The number of atoms in
1. 0 answers
2. 608 views
Neptunium 23993 Np has a decay constant of 3.40 ×10-6 s-1. A 3.0-mg sample of Np-239 is prepared. The activity of the Np-239
1. 3 answers
2. 586 views
Neptunium 23993 Np has a decay constant of 3.40 ×10-6 s-1. A 3.0-mg sample of Np-239 is prepared. The activity of the Np-239
1. 1 answer
2. 900 views
A proton is projected at a stationary 6238 Ni aluminum target. The proton momentarily comes to ahalt at a distance from the
1. 0 answers
2. 603 views
the nuclei Co-57 an odd-even unstable nucleus is often used as a source of radiation in nuclear processes. Show that the nuclei
1. 0 answers
2. 560 views
If = 38° and y = 42 cm, what is the value of z to the nearest tenth of a centimeter?
1. 3 answers
2. 890 views
A force of 80N acts on a body initially at rest and moves 72m in 6s. If the force is removed after 6s calculate how far the body
1. 2 answers
2. 1,582 views
a handbag weighing 162N is carried by the students each holding the handle of the bag next to him. If each handle is inclined at
1. 2 answers
2. 1,179 views
It takes a hose 4 minutes to fill a rectangular aquarium 8 inches long, 9 inches wide, and 10 inches tall. How long will it take
1. 1 answer
2. 910 views
Find the variation constant and an equation of variation if y varies directly as x and the following conditions apply.
1. 1 answer
2. 574 views
what is the work done a bringing a charge from infinity to a point P, if the point P is 5m to the positive y-axis from a charge
1. 2 answers
2. 963 views
Two trucks A and B each travelling at 40 km/hr, move towards each other . At the instance when the two trucks are at a distance
1. 5 answers
2. 1,707 views
The demand for your hand-made skateboards, in weekly sales, isq = −4p + 600 if the selling price is $p. You are prepared to
1. 1 answer
2. 864 views
A license plate in a particular state consists of 5 characters. The first 4 characters are made up using the digits 0-9, but the
1. 1 answer
2. 689 views
perform this operation to the correct significant figure. 2.0cm × 0.01m in the correct significant figure.should the answer be
1. 0 answers
2. 563 views
an ideal gas occupies a volume of 22.4litres at stp while absorbing 2.53KJ of heat from the surrounding the gas expands
1. 1 answer
2. 1,674 views
determine the energy stored in a 2m long wire of cross sectional area 0.5mm^2 kf the force of 50N is applied to it.
1. 0 answers
2. 575 views
A body whose weight is W1=75N is tied to anotherbody whose weight is W2=45N .If the coefficient of kinetic friction between W1
1. 1 answer
2. 601 views
A body whose weight is W1=75N is tied to another body whose weight is W2=45N .If the coefficient of kinetic friction between W1
1. 2 answers
2. 727 views
need a probability distribution to select a parking stall in a parking lot with 50 stalls
1. 0 answers
2. 430 views
C2H6 <> C2H4 + H2. when 1.00mol ethane is cracked at 180kPa and 1000K, the yield of ethene is 0.36mol. Calculate the value Kp at
1. 0 answers
2. 613 views
fine sand moves through pipes just like fluid. a sandblasting machine moves fine sand through a pipe of inner diameter 2.8 cm at
1. 1 answer
2. 606 views
a 2.0 kg solid mass has an apparent weight 12.34N when totally immersed in water. Calculate the apparent weight of the body when
1. 2 answers
2. 2,380 views
Ice cubes of total mass 6.00 grams have temperature -4.0°C. Then they are placed in 50.0 grams of water at 20.0°C in an
1. 0 answers
2. 727 views
Find the first order partial derivatives. z=ln(xy-sqrt(x^2-y^2)
1. 1 answer
2. 1,378 views
A fire hydrant that is 1.5 feet high casts a shadow that is 2.5 feet long. At the same time of day, a lamppost casts a shadow 15
1. 3 answers
2. 1,769 views
the mass of helium 4 atom is 6.64648 x 10^24 g and each of its two electrons has the mass 9.10939 x 10^-25 what fraction of the
1. 0 answers
2. 571 views
If 200 cm3 of tea at 95°C is poured into a 150-g glass cup initially at 25°C, what will be the common final temperature T of
1. 4 answers
2. 2,771 views
Evaluate the given integral, where C is the circle with positive orientation.Cauchy integral theorem, integral over C
1. 0 answers
2. 702 views
How many quarts of permanent anti-freeze must be added to 10% quarts of a 40% anti-freeze solution in a radiator of a truck to
1. 1 answer
2. 615 views
A triangle is such that the largest angle is 12 times the smallest angle. The third angle is 20 less than the largest angle.
1. 1 answer
2. 672 views
Determine the enthalpy of 5.0 kg of water at 850 kPa.thankyou very much!
1. 1 answer
2. 971 views
If 25.4 kg of copper at 33°C receives 240 kJ of heat. Calculate the final temperature of the metal.
1. 1 answer
2. 2,212 views
What is the factor of safety for a steel hanger having an ultimate strength of 70,000 Newton percm2 and supporting a load of
1. 0 answers
2. 624 views
A hydraulic plunger has a 12 cm diameter and a force of 350 kN acts on it. What is the pressure exerted on the plunger?
1. 1 answer
2. 2,112 views
Could someone please help.Consider the function 3x^2-7. Find f(-2). a) -1 b) 5 c) -5 d) 0 I think its a) -1 but not sure. Thank
1. 1 answer
2. 312 views
Could someone please help.Consider the function 3x^2-7. Find f(-2). a) -1 b) 5 c) -5 d) 0 I think its a) -1 but not sure. Thank
1. 1 answer
2. 348 views
A ball is thrown from the ground level with a x-velocity of 25m/s and a y-velocity of 45m/s. What is the ball velocity at the
1. 1 answer
2. 510 views
The hook of a spring balance carries an object of mass 5kg And the balance is suspended vertically from the roof of a lift. Find
1. 0 answers
2. 631 views
A sofa cost $500 and is on sale for 20 % off. what is the final cost of the sofa after the discount?
1. 1 answer
2. 491 views
since a rectangle forms two area of a circle shouldn't it also form two circumference in a cylinder
1. 2 answers
2. 405 views
A reaction proceeds by the following three-step mechanism with elementary rate coefficients,k. A + B → C k 1 C → A + B k -1
1. 0 answers
2. 511 views
Consider the system of components connected as in the accompanying picture. Components 1 and 2 are connected in parallel, so
1. 1 answer
2. 1,540 views
An academic department with five faculty members—Anderson, Box, Cox, Cramer, and Fisher—must select two of its members to
1. 4 answers
2. 4,246 views
(6- 1/2 I)-(3+ 9/2 I)
1. 1 answer
2. 301 views
All of us have different stand on what to believe in and it varies because it depends on one’s life experiences.is my sentence
1. 2 answers
2. 437 views
all of us has or have?
1. 3 answers
2. 521 views
The next step is to construct side PS of the figure so that side PS is parallel and congruent to side QR. The chart below shows
1. 3 answers
2. 2,527 views
Two men and six boys can cut a field in 3hours. If the men work at 3/2 times that of the boys, how many men are required to cut
1. 3 answers
2. 1,450 views
Two men and six boys can cut a field in 3 hours. If the men work at 3/2 times that of the boys, how many men are required to cut
1. 5 answers
2. 1,488 views
a final examination score in General maths is weighted four times as much as each test score If the student has a final exam
1. 3 answers
2. 895 views
10 red, 10 blue, 10 green matches are used to build a regular icosahedron, how many possible solutions are there?
1. 2 answers
2. 489 views
For the 6 faces and 8 vertices of a regular hexahedron, respectively sealed with red and blue these 2 beads (each face contains
1. 0 answers
2. 488 views
There are 4 kinds of colored beads( r, g, b, y) to seal onto the 6 vertices of a regular hexagon, how many solutions are there?
1. 0 answers
2. 393 views
Use 3 types of colored beads to seal onto the vertices of a regular pentagon, how many possible solutions are there? Hint: The
1. 0 answers
2. 420 views
Paint the 4 faces of a regular tetrahedron by using 3 types of colors, how many possible solutions are there?
1. 0 answers
2. 397 views
We have two kind of tiles : 1 x 1 and 2 x 2, and use them to cover the 8 x 3 road without overlapping, how many different ways
1. 1 answer
2. 474 views
Suppose a manufacturer produces the football as shown below, they want to print one 2014 football World Cup logo and one
1. 1 answer
2. 603 views
The graph of a second-order polynomial is shown below, and the intercepts with the axes are marked. Explain how you can use the
1. 1 answer
2. 1,146 views
The plane P1 has equation r = (2,1,1)+lambda(-2,1,8)+mu(1,-3,-9)The plane P2 has equation r = (2,0,1)+s(1,2,1)+t(1,1,1) Show
1. 1 answer
2. 665 views
A two-tailed test is conducted at the 0.10 significance level. What is the P-value required to reject the null hypothesis?A.
1. 0 answers
2. 853 views
T varies inversely as R and T =3.5 when R =10
1. 1 answer
2. 433 views
Show how you would solve by Substitution:2x + y = 0 x – 3y = -7 Show how you would solve by Elimination: 3x + 4y = 1 5x – 3y
1. 1 answer
2. 475 views
Which statement is true regarding nuclear energy
1. 1 answer
2. 432 views
Brenda takes out a twenty year loan of R400,000..she repays the loan by means of equal montly payments starting one month after
1. 1 answer
2. 731 views
write an equation of a circle with the given center and radius. center (–7 –3) and radius 13
1. 1 answer
2. 538 views
A number of circles touch each ather. The area of the smallest circle is 4picm2 and each consecutive circle has area 9/4 times
1. 2 answers
2. 844 views
A number of circles touch each ather. The area of the smallest circle is 4picm2 and each consecutive circle has area 9/4 times
1. 2 answers
2. 701 views
A number of circles touch each ather. The area of the smallest circle is 4picm2 and each consecutive circle has area 9/4 times
1. 0 answers
2. 617 views
A number of circles touch each ather. The area of the smallest circle is 4n cm^2 and each consecutive circle has area 9/4 times
1. 0 answers
2. 632 views
If 3•5/9 and 40•1/2 are the 1st and last term of geometric sequence. Determine the value of fifth term if there are seven
1. 1 answer
2. 447 views
Three terms of geometric sequence: T1,T2 and T3.If T2=T1+4 and T3=T2+9 determine the values of T1,T2 and T3.
1. 2 answers
2. 976 views
1/tan60';sin90',tan60';...form a sequence. Calculate the fourth term.
1. 3 answers
2. 708 views
limit of x approaches -3. (2x^2 + 4x + 1)
1. 0 answers
2. 348 views
what are the factors of p^2 + 11p - 42 ?Thank You.
1. 1 answer
2. 412 views
Which of the following statements is CORRECT regarding deciding whether an alcohol sale is legal?A. IF a person looks over 21,
1. 6 answers
2. 15,943 views
A compound contains 14.5 g of magnesium and 3.5 g of oxygen. What is the mass percent of oxygen in the compound?
1. 3 answers
2. 595 views
Which choice best describes the underlined words in the sentence?Look at the stars and planets on a clear night. (Points : 3)
1. 3 answers
2. 733 views
Tom wants to run 2 1/2 miles on a 2/3mile track how many laps does tom run. I had add 2/3+2/3= 4/3 adding it up to get a 2 1/2
1. 1 answer
2. 450 views
A band played 3 concerts and earned a total of $321.00. The band earned about the same amount for each concert. Estimate how
1. 4 answers
2. 1,075 views
a living room measure 450 x 330cm. find the dimension of the largest square tile that can be used to tile the floor without
1. 2 answers
2. 1,653 views
use the z score table to find the floolwing:a) p(1.2<z<2.4) b) p(z>1.675) please show working out
1. 1 answer
2. 459 views
us e the formula z=x-u/SD to determine the z score for a score of 34.5 a normal distribution if the mean is 46.5 and the
1. 1 answer
2. 527 views
Charlotte received a score of 68 on both her English and Maths tests. The mean for English was 52 and the mean for Maths was 55.
1. 3 answers
2. 798 views
You live under a bridge that goes over a river. the underneath side of the bridge is an arc that can be modeled with the
1. 1 answer
2. 875 views
A sprinter set a high school record in track and field, running 200.0 m in 21.0s . What is the average speed of the sprinter in
1. 2 answers
2. 1,839 views
•The x-intercepts of the graph of y=f(x)•The real zeros of the function f •The real solutions to the equation f(x)=0 Use
1. 1 answer
2. 910 views
Give a piece-wise function p(x) where p(2)=5 and p(-1)=3
1. 9 answers
2. 469 views
As compared to its first year of operation, ABC Company grew 8% in the second year and an additional 2% per year for the next
1. 0 answers
2. 671 views
A mastaba is:
1. 2 answers
2. 493 views
The heat capacity of object B is twice that of object A. Initially A is at 300 K and B is at 450 K. They are placed in thermal
1. 2 answers
2. 1,588 views
The coefficient of expansion of a certain steel is 0.000012 per C^(degree) . The coefficient of volume expansion, in
1. 4 answers
2. 6,370 views
Find all zeros of the polynomialP(x)=x^3 - 2 x^2 - 9 x - 30.
1. 1 answer
2. 392 views
In comprison with John Kennedy, Lyndon Johnson wasA. better educated B. more skillful at working the congress C. a better public
1. 2 answers
2. 809 views
Which one of the following statements about intelligence is the most accurate a. Iq is a valid measurement, and environmental
1. 1 answer
2. 1,780 views
What inequality represents the sentence below?The product of a number and 5 is no more than 8. A. 5n < 8 B. 5n > 8 C. 5n>8
1. 4 answers
2. 689 views
Kristen lives directly east of the park. The football field is directly south of the park. The library sits on the line formed
1. 1 answer
2. 2,853 views
What is the maximum heart rate for a 35-year-old?A. 121.1 B. 183.5 C. 187 D. 205.55
1. 2 answers
2. 584 views
Grover Cleveland is to fathering a child out of wedlock as James G. Blaine is to:Questionable loyalty to his country Drug
1. 1 answer
2. 1,074 views

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