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Elisa
Questions and answers by visitors named
Elisa
Questions (116)
Acid spills are often neutralized with sodium carbonate. For example
Na2CO3 (s) + H2SO4 (aq) Na2SO4 (aq) + CO2 (g) + H2O (l)
6 answers
3,567 views
consider the following chemical reaction:
2 H20 ---> 2H2 + O2 How many moles of H20 are required to form 1.8 L of O2 at a
1 answer
508 views
What would the two half reactions look like for
Sr(s) reacting with excess 1M H4NHCO3. I really do not understand. It says that a
1 answer
342 views
1. It has been suggested that rotating cylinders about 11 mi long and 5.2 mi in diameter be placed in space and used as
2 answers
542 views
1. It has been suggested that rotating cylinders about 11 mi long and 5.2 mi in diameter be placed in space and used as
2 answers
1,073 views
In a popular amusement park ride, a rotating cylinder of radius 4.00 m is set in rotation at an angular speed of 5.00 rad/s. The
3 answers
2,624 views
The force shown in the force-time diagram in Figure P6.11 acts on a 1.4 kg object.
(a) Find the impulse of the force. (b) Find
4 answers
5,838 views
D-Glucose, C6H12O6, is an aldohexose sugar which occurs commonly in nature. In a text or reference book look up "-D-(+)-Glucose
1 answer
466 views
A ball of mass 0.120 kg is dropped from rest from a height of 1.25 m. It rebounds from the floor to reach a height of 0.600 m.
5 answers
2,309 views
An archer shoots an arrow toward a 300 g target that is sliding in her direction at a speed of 2.35 m/s on a smooth, slippery
2 answers
632 views
1. A 10.0 g object moving to the right at 25.0 cm/s makes an elastic head-on collision with a 15.0 g object moving in the
3 answers
1,984 views
A 45.0 kg girl is standing on a 163 kg plank. The plank, originally at rest, is free to slide on a frozen lake, which is a flat,
4 answers
4,447 views
Calculate the magnitude of the linear momentum for the following cases.
(a) a proton with mass 1.67 10-27 kg, moving with a speed
4 answers
3,644 views
1. A centrifuge in a medical laboratory rotates at an angular speed of 3650 rev/min. When switched off, it rotates through 50.0
3 answers
1,708 views
An archer shoots an arrow toward a 300 g target that is sliding in her direction at a speed of 2.35 m/s on a smooth, slippery
2 answers
586 views
1. A 3.25 kg steel ball strikes a wall with a speed of 10.0 m/s at an angle of 60.0° with the surface. It bounces off with the
3 answers
771 views
A rotating wheel requires 5.00 s to rotate 30.0 revolutions. Its angular velocity at the end of the 5.00 s interval is 100.0
2 answers
1,139 views
An 8.00 g bullet is fired into a 180 g block that is initially at rest at the edge of a table of 1.00 m height. The bullet
3 answers
707 views
A 705 N man stands in the middle of a frozen pond of radius 4.0 m. He is unable to get to the other side because of a lack of
2 answers
898 views
A student stands at the edge of a cliff and throws a stone horizontally over the edge with a speed of 15.0 m/s. The cliff is h =
4 answers
683 views
One of the fastest recorded pitches in major-league baseball, thrown by Billy Wagner in 2003, was clocked at 101.0 mi/h . If a
5 answers
8,295 views
A boat moves through the water of a river at 5 m/s relative to the water, regardless of the boat's direction. If the water in
2 answers
742 views
A boat moves through the water of a river at 5 m/s relative to the water, regardless of the boat's direction. If the water in
4 answers
1,302 views
A quarterback throws a football toward a receiver with an initial speed of 21 m/s at an angle of 30° above the horizontal. At
2 answers
1,250 views
An airplane flies 200 km due west from city A to city B and then 280 km in the direction of 30.5° north of west from city B to
2 answers
592 views
A car is parked on a cliff overlooking the ocean on an incline that makes an angle of 20.0° below the horizontal. The negligent
4 answers
2,533 views
A jet airliner moving initially at 300 mi/h due east enters a region where the wind is blowing at 100 mi/h in a direction 26.0°
5 answers
9,340 views
A quarterback throws a football toward a receiver with an initial speed of 21 m/s at an angle of 30° above the horizontal. At
4 answers
1,664 views
An airplane flies 200 km due west from city A to city B and then 280 km in the direction of 30.5° north of west from city B to
4 answers
1,307 views
A quarterback throws a football toward a receiver with an initial speed of 21 m/s at an angle of 30° above the horizontal. At
2 answers
844 views
There is a parabolic position vs time graph.
Which of these is true: The object moves 1. in a parabolic trajectory. 2. along a
4 answers
1,179 views
Objects of masses m1 = 4.00 kg and m2 = 9.00 kg are connected by a light string that passes over a frictionless pulley as in
3 answers
2,294 views
A woman at an airport is towing her 27.0 kg suitcase at constant speed by pulling on the strap at an angle θ above the
4 answers
769 views
An object with mass m1 = 5.00 kg, rests on a frictionless horizontal table and is connected to a cable that passes over a pulley
4 answers
1,592 views
Two packing crates of masses m1 = 10.0 kg and m2 = 3.50 kg are connected by a light string that passes over a frictionless
6 answers
5,149 views
Two blocks are fastened to the ceiling of an elevator as in Figure P4.19. The elevator accelerates upward at 2.00 m/s2. The
4 answers
7,767 views
A 3.6 kg mass hangs at one end of a rope that is attached to a support on a railroad car. When the car accelerates to the right,
4 answers
2,018 views
A 4.0 g bullet leaves the muzzle of a rifle with a speed of 310 m/s. What force (assumed constant) is exerted on the bullet
10 answers
1,026 views
The force exerted by the wind on the sails of a sailboat is 310 N north. The water exerts a force of 240 N east. If the boat
4 answers
682 views
Find the tension in the two wires that support the 100 N light fixture. Assume θ is 39°.
left wire: right wire:
4 answers
2,051 views
The force shown in the figure below is the net eastward force acting on a ball. The force starts rising at t=0.012 s, falls back
2 answers
954 views
The force sensor measures the force on the sensor due to the bumper, but the cart's momentum change arises from the force on the
1 answer
1,112 views
A bat hits a moving baseball. If the bat delivers a net eastward impulse of 0.7 N-s and the ball starts with an initial
4 answers
952 views
A 175 kg merry-go-round in the shape of a uniform, solid, horizontal disk of radius 1.50 m is set in motion by wrapping a rope
4 answers
1,720 views
The four tires of an automobile are inflated to a gauge pressure of 1.8 multiplied by 105 Pa. Each tire has an area of 0.025 m2
2 answers
760 views
The four tires of an automobile are inflated to a gauge pressure of 1.8E10^5 Pa. Each tire has an area of 0.025 m2 in contact
2 answers
817 views
Determine the elongation of the rod in if it is under a tension of 5.7E10^3 N.
The rod is made of aluminum and copper. From the
4 answers
1,365 views
Determine the elongation of the rod in if it is under a tension of 5.7E10^3 N.
The rod is made of aluminum and copper. From the
5 answers
3,320 views
Can't get correct answer
An object weighing 340 N in air is immersed in water after being tied to a string connected to a
2 answers
1,053 views
drwls for the question below, the answer seems to be wrong:
The four tires of an automobile are inflated to a gauge pressure of
2 answers
522 views
Please help. I got 338.82 for the velocity and wanted to get the distance, but I can't seem to do it because I don't have the
7 answers
593 views
A simple pendulum is 9.00 m long.
(a) What is the period of simple harmonic motion for this pendulum if it is hanging in an
2 answers
1,167 views
A bat flying at 5.0 m/s emits a chirp at 35 kHz. If this sound pulse is reflected by a wall, what is the frequency of the echo
4 answers
1,644 views
A simple pendulum with a length of 1.50 m is suspended from the ceiling of a train. What is the period of simple harmonic motion
2 answers
685 views
A bat flying at 6.00 m/s emits a chirp at 40.0 kHz. If this sound pulse is reflected by an insect moving away from the bat at
2 answers
1,218 views
A uniform string fixed at one end passes over a pulley and then is attached to a hanging object. The string is horizontal
2 answers
657 views
A stone is thrown downward into a well with an initial speed of 5.00 m/s. The sound of splash is heard 1.50 s later. Find the
1 answer
447 views
Hi! I have a question
Heres the problem: 3-2[6-(4y-1)] I got -8y-11 but it wasn't right and I don't know what i did wrong help
5 answers
416 views
How come (2xy^2)^3 is equal to 8x^3 y-6? I thought that six exponent should be a five since you add them together. So 2 and 3
1 answer
362 views
Write an equation of a line that passes through the points (-6,7) and has a slope of -4
How do I do this? it would be y equals
1 answer
461 views
Write the equation for the line that passes through the point (6,7) and has a slope of 1/2. Give as a simplified fraction.
Again,
1 answer
462 views
Write an equation that passes through the points (4, 3) and (2, -2)
I have -2 -3 is -5 and 2-4 is -2 so y equals -5/2x plus b. I
1 answer
424 views
Write the equation passing through the points (-9, 6 ) and (1, -5). The worksheet has multiple choice, so I know y intercept is
2 answers
568 views
Write an equation in point slope for for the line thatpasses through (4,5) and has a slope of 6
I got -19. Is this correct?
1 answer
339 views
Graphthe equation y plus 6 equals 1/8(x-2
1/8x - 2/8 add 2/8 to 6, so 61 times 8/8 makes it 48/8 plus 2/8 is 50/8 mx plus c would
1 answer
464 views
Could you please show me how to do this.
Write an equation of the vertical and horizontal lines that pass through the given point
4 answers
394 views
Write an equation in standard form for the line through (9, -2) and (13, -8)
Do I solve this by doing y2-y1/x2-x1. That would
1 answer
446 views
Graph y-7 equals 9(x plus 6)
So 9x plus 54 54 plus 7 is 61 So y equals 9x plus 61. is it correct?
3 answers
456 views
Write the equation in standard form for the line that passes through (6, -1) and (10,-*)
So far I have -8-1 is -9 and 10-6 is 4,
3 answers
990 views
Instead, he enjoyed looking for hours and hours... In this phrase is the word looking a noun, adjective,verb, or an adverb?
1 answer
363 views
The first side of a triangle is 8 meters longer than twice the second side. The third side is 3 times the second side. The
3 answers
1,010 views
A particle is moving so that its velocity, v(t) = t-64/t^2 for 2≤t≤6. find the total distance traveled by the particle.
5 answers
866 views
Suppose that the number of bacteria in a culture at time t is given by
N = 4950 ( 28 + t*e ^(-t/24)) Find the LARGEST and
2 answers
554 views
Suppose that the number of bacteria in a culture at time t is given by
N = 4950 ( 28 + t*e ^(-t/24)) Find the LARGEST and
1 answer
472 views
Suppose that the number of bacteria in a culture at time t is given by
N = 4950 ( 28 + t*e ^(-t/24)) Find the LARGEST and
2 answers
1,324 views
A particle moves along the s-axis. Use the given information to find the position of the particle. v(t) = 8t3;
s(0) = 5.
2 answers
519 views
A particle moves along the s-axis. Use the given information to find the position of the particle. v(t)=8t3 ;
s(0) = 5.
5 answers
902 views
A particle is moving so that its velocity, v(t) = t-64/t^2 for 2≤t≤6. find the total distance traveled by the particle.
1 answer
387 views
Factor completely. Remember to look first for a common factor. If a polynomial is prime, state this
-4t^2 + 64
2 answers
508 views
Factor completely. If a polynomial is prime, state this
9 + 8t^2 - 18t
2 answers
545 views
Factor by grouping, if possible, and check
5x3 + 4x2 − 10x – 8
1 answer
371 views
The area of a rectangular athletic field is represented by the expression 16y^7+32y^5+80y^3 square meters. Write an algebraic
2 answers
491 views
The area of a rectangular athletic field is represented by the expression 25y^2-4z^2 square meters. Write an algebraic
1 answer
462 views
Andrew factored the expression -12x^3-28x^2-3x as -4x (3x^2-7x+9). But when Melissa applied the distributive law and multiplied
2 answers
579 views
Solve by factoring:
2a^2 − 3a = −5
1 answer
388 views
Abby rows 10 km upstream and 10 km back in a total time of 3 hr. The speed of the river is 5km/h. Find Abby’s speed in still
3 answers
449 views
15t^2+7t=2
4 answers
300 views
Factor the following expression completely:
45x^3y – 80xy
2 answers
854 views
Factor the expression 16x^2-72xy+81y^2 into a product of binomials.
2 answers
877 views
Factor out the greatest common factor from the expression 36x^3-30x^2
3 answers
785 views
Factor out the greatest common factor from the expression
9a2b3 – 12a2b4 – 24a3b
2 answers
917 views
Megan factored the expression 72x^2-43x+6 as (9x-3)(8x-2). But when Jacob applied the FOIL principle and multiplied out
2 answers
588 views
Use the “difference of squares” rule to factor the following expression: 100a^6-64b^8
1 answer
409 views
A 125-ft diagonal brace on a bridge connects a support of the center of the bridge to a side support on the bridge. The
3 answers
898 views
The length of a rectangle is 2 meters more than its width. If the area is 63 square meters, what are the length and width?
4 answers
1,254 views
Megan factored the expression 72x^2-43x+6 as (9x-3)(8x-2). But when Jacob applied the FOIL principle and multiplied out
2 answers
563 views
Is this reaction exothermic or endothermic? Fe(NO3)3+ NaSCN
1 answer
867 views
A box contains 4 quaters, 3 dimes, and 2 nickels. you draw out two coins and keep them both. What is the probability that both
2 answers
574 views
A dress normally selling for $60 was on sale for $48. What was the percent discount?
3 answers
586 views
please help simplify
5(x-1) - 3(x^2 + 4x + 5) - 8(x + 7)
1 answer
248 views
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