Browse 0-9
Alphabetical listing with fast deep pagination.
131141 items • Page 349 / 2623
1. A (n) ____________________ hypothesis is a hypothesis that stands in oppositi
1. A (n) ____________________ hypothesis is a hypothesis that stands in opposition to the null hypothesis. 2. An alternative or research hypothesis that specifies the n…
1. A ) Explain how geography, mass extinctions and adaptive radiation help expla
1. A) Explain how geography, mass extinctions and adaptive radiation help explain the diversity of living organisms. B) Explain how changes in development can explain the evolutio…
1. A +5 q 4 point charge is glued down on a horizontal frictionless table. It is
1. A +5q4 point charge is glued down on a horizontal frictionless table. It is tied to a – 3q4 point charge by a light, nonconducting wire of length d. A uniform electric field E …
1. A -20nC charge is located at the origin. What is the strength of the electric
1. A -20nC charge is located at the origin. What is the strength of the electric field at the position (x,y)=(?5.0cm,?5.0cm)? What is the strength of the electric field at the pos…
1. A -4.50 nC point charge is surrounded by a electrostatic conducting spherical
1. A -4.50 nC point charge is surrounded by a electrostatic conducting spherical shell that has an inner radius of 7.00 cm, an outer radius of 9.00 cm, and a net charge of +- 6.50…
1. A .006 kg bullet is fired at a speed of 240 m/s into a 1.2 kg pendulum of len
1. A .006 kg bullet is fired at a speed of 240 m/s into a 1.2 kg pendulum of length .73 m. After the impact, the pendulum swings upward. How high does the pendulum swing, before c…
1. A .50 - g sample of immunoglobulin G, a nonvolatile nonelectrolyte, is dissol
1. A .50 - g sample of immunoglobulin G, a nonvolatile nonelectrolyte, is dissolved in enough water to make .100 L of solution, and the osmotic pressure of the solution at 25 degr…
1. A .write a chemical equation which goes with the statement: i) K b = 4.3 X 10
1. A.write a chemical equation which goes with the statement: i) Kb= 4.3 X 10-10 for aniline (C6H5NH2) ii)Kb = 2.1 X 10-4 for carbonate ion B. Kb =1.3 X 10-3 for C5H11N and kb= 6.…
1. A 0.0340 kg bullet traveling at 120. m/s embeds itself in a 1.24 kg wooden bl
1. A 0.0340 kg bullet traveling at 120. m/s embeds itself in a 1.24 kg wooden block which is at rest on a smooth surface. The block then slides toward a spring and collides wi…
1. A 0.0450 M solution of benzoic acid has a pH of 2.71. Calculate pKa for this
1. A 0.0450 M solution of benzoic acid has a pH of 2.71. Calculate pKa for this acid. 2. A 0.0460 M solution of HA is 0.80% dissociated. Calculate pKa for this acid. 3. Consider a…
1. A 0.060kg ball is propelled by a 1.10kg racquet from rest to a speed of 40.0m
1. A 0.060kg ball is propelled by a 1.10kg racquet from rest to a speed of 40.0m/s. If the two objects are in contact for 250ms, calculate the average force exerted by the racquet…
1. A 0.10 M solution of NaCH3COO has a pH of 8.8. Write the equilibrium equation
1. A 0.10 M solution of NaCH3COO has a pH of 8.8. Write the equilibrium equation and then calculate the Kb for the salt, NaCH3COO. Show your work. 2. The pH of a weak acid solutio…
1. A 0.100 M solution of an unknown acid, HA, is 3.54% ionized. Complete the fol
1. A 0.100 M solution of an unknown acid, HA, is 3.54% ionized. Complete the following ice table, but instead of using the variable x, calculate the number values of each quantity…
1. A 0.100 M solution of the weak acid HB has a pH of 3.00. What are the [H+], [
1. A 0.100 M solution of the weak acid HB has a pH of 3.00. What are the [H+], [B-], and Ka for this acid? 2. A solid acid is dissolved in water. Half the solution is titrated to …
1. A 0.100-mol sample of NO2 was placed in a 10.0-L container and heated to 750
1. A 0.100-mol sample of NO2 was placed in a 10.0-L container and heated to 750 K. The total pressure of the equilibrium mixture as a result of the decomposition 2NO2(g) 2NO(g) + …
1. A 0.12kg body is connected to a wall by a spring with a spring constant of 57
1. A 0.12kg body is connected to a wall by a spring with a spring constant of 570 N/m. The body experiences simple oscillatory motion when pulled from its equilibrium rightward by…
1. A 0.14-g sample of a purified protein is dissolved in water to give 2.0 mL of
1. A 0.14-g sample of a purified protein is dissolved in water to give 2.0 mL of solution. The osmotic pressure is found to be 17.2 torr at 25°C. Calculate the protein's molar mas…
1. A 0.150-kg, 50.0-cm-long uniform bar has a small 0.050-kg mass glued to its l
1. A 0.150-kg, 50.0-cm-long uniform bar has a small 0.050-kg mass glued to its left end and a small 0.130-kg mass glued to the other end. You want to balance this system horizonta…
1. A 0.150-kg, 50.0-cm-long uniform bar has a small 0.050-kg mass glued to its l
1. A 0.150-kg, 50.0-cm-long uniform bar has a small 0.050-kg mass glued to its left end and a small 0.130-kg mass glued to the other end. You want to balance this system horizonta…
1. A 0.17-mole sample of nitrogen gas occupies a volume of 2.80 L . What is the
1. A 0.17-mole sample of nitrogen gas occupies a volume of 2.80 L . What is the volume of 0.29 mol of nitrogen gas under the same conditions? Express your answer using two signifi…
1. A 0.2 kg bullet moving 1000m/s strikes and becomes imbeddedin a 1 kg wooden b
1. A 0.2 kg bullet moving 1000m/s strikes and becomes imbeddedin a 1 kg wooden block resting on a table. What is their velocity after the collision? A. What type of collision is #…
1. A 0.20 kg glider moving at 5 m/s to the rightcollides with a 0.25 kg glider m
1. A 0.20 kg glider moving at 5 m/s to the rightcollides with a 0.25 kg glider moving 2 m/s to the left. Afterwards, the0.25 kg glider moves 2 m/s to the right and the 0.20 kgg…
1. A 0.30-g pebble is held by a child whose feet are firmly planted on the groun
1. A 0.30-g pebble is held by a child whose feet are firmly planted on the ground. (a) Find the forces (magnitude and direction) exerted by the earth on the pebble and exerted…
1. A 0.33-kg mass is hanging from a spring with spring constant 12 N/m. Then the
1. A 0.33-kg mass is hanging from a spring with spring constant 12 N/m. Then the mass is displaced from the equilibrium by 2.7 cm and let go. What is the resulting frequency of th…
1. A 0.3kg ball is traveling toward a wall in the +x direction with a speed of 1
1. A 0.3kg ball is traveling toward a wall in the +x direction with a speed of 15m/s. It hits the wall and bounces directly back with a speed of 12m/s. What is its change in momen…
1. A 0.4243-g sample of CaCO 3 is dissolved in 12 M HCI and the resulting soluti
1. A 0.4243-g sample of CaCO 3 is dissolved in 12 M HCI and the resulting solution is diluted to 250.0 mL in a volumetric flask. a) how many moles of the CaCO 3 are used (formula …
1. A 0.5 kg mass extends a spring 1 cm. What is the frequency of oscillation of
1. A 0.5 kg mass extends a spring 1 cm. What is the frequency of oscillation of this mass and spring? 2. A fly lands on the mass. This increases the oscillation period by 0.001 se…
1. A 0.516 g portion of a sample that contains sodium oxalate is dissolved in wa
1. A 0.516 g portion of a sample that contains sodium oxalate is dissolved in water to which sulfuric acid has been added. The end point of the titration of the solution with 0.02…
1. A 0.5188g sample of CaCO3 is dissolved in 6M HCl and the resulting solution i
1. A 0.5188g sample of CaCO3 is dissolved in 6M HCl and the resulting solution is diluted to 250.0mL in a volumetric flask. (a)How many moles of CaCO3 are in the sample? (formula …
1. A 0.80 kg arrow flying in a straight line at 70.0 m/s hits and sticks in a bl
1. A 0.80 kg arrow flying in a straight line at 70.0 m/s hits and sticks in a block of wood at rest. If the mass of wood block is 5.4 kg, what is the velocity of the two after the…
1. A 0.875 g sample of an unknown acid requires 32.1mL of a 0.182M barium hydrox
1. A 0.875 g sample of an unknown acid requires 32.1mL of a 0.182M barium hydroxide solution for neutralization. Assuming the acid is diprotic, calculate the molar mass of the aci…
1. A 0.897g sample containing chloride ion is treated with excess lead (II) nitr
1. A 0.897g sample containing chloride ion is treated with excess lead (II) nitrate. The lead (II) chloride precipitated is filtered into a filter paper that weighed 0.923g. Af…
1. A 0.9132-gram sample of iron ore is dissolved in aqueous hydrochloric acid. I
1. A 0.9132-gram sample of iron ore is dissolved in aqueous hydrochloric acid. It dissolves completely and in the process, all of the iron goes into solution as Fe2+ ion. The foll…
1. A 0.l0-kilogram solid rubber ball is attached to the end ofa 0.80-meter lengt
1. A 0.l0-kilogram solid rubber ball is attached to the end ofa 0.80-meter length of light thread. The ball is swung in avertical circle, as shown in the diagram above. Point P, t…
1. A 07121 g sample of a wheat flour was analyzed by Kjeldahl method. The ammoni
1. A 07121 g sample of a wheat flour was analyzed by Kjeldahl method. The ammonia formed by addition of concentrated base after digestion with 112504 was distilled into 25.00 mL o…
1. A 1 kg block of wood is moving with a velocity of 10 m s^-1 on top of a table
1. A 1 kg block of wood is moving with a velocity of 10 m s^-1 on top of a table. The coefficient of kinetic friction between the block of wood and the table is 0.1. The block of …
1. A 1 kg of ice at 00C is placed into a perfectly insulated, sealed container t
1. A 1 kg of ice at 00C is placed into a perfectly insulated, sealed container that has 2 kg of water also at 00C. The water and ice completely fill the container, but the contain…
1. A 1 m tall 3-year old firl and her isometrically scaled up 2 m tall father ar
1. A 1 m tall 3-year old firl and her isometrically scaled up 2 m tall father are running barefoot down a gravel beach. The daughter is running along cheerfully, but her father's …
1. A 1,224-kg car is moving up a road with a slope (grade) of 24% while slowing
1. A 1,224-kg car is moving up a road with a slope (grade) of 24% while slowing down at a rate of 1.4 m/s^2. What is the direction and magnitude of the frictional force? (define p…
1. A 1,300 kg car moving at 7 m/s is stopped by the action of its breaks. The wo
1. A 1,300 kg car moving at 7 m/s is stopped by the action of its breaks. The work done by the car's breaks is ________J. 2. Assume an asteroid is in the shape of a sphere and has…
1. A 1,661-kilogram roller coaster car starts at point A almost at rest. It runs
1. A 1,661-kilogram roller coaster car starts at point A almost at rest. It runs downhill into a valley. At its bottom, the valey can be described by a circle with radius 7 m. Fin…
1. A 1-meter long aluminum cylindrical wire of 2 mm^2 cross-sectional area has a
1. A 1-meter long aluminum cylindrical wire of 2 mm^2 cross-sectional area has a uniform current of 10 amperes in it. The resistivity of aluminum is 2.63 * 10^-8 ohm-meter. The el…
1. A 1.0 kg block slides off the edge of a frictionless horizontal table with a
1. A 1.0 kg block slides off the edge of a frictionless horizontal table with a speed of 3.0 m/s. It lands in the back of a child’s toy truck, 1.0 m below the table top, and a hor…
1. A 1.00-kg duck is flying horizontally overhead at 1.50 m/s when a hunter fire
1. A 1.00-kg duck is flying horizontally overhead at 1.50 m/s when a hunter fires straight up. The 10-g bullet is moving vertically at a speed of 100 m/s when it hits the duck and…
1. A 1.00-kg duck is flying horizontally overhead at 1.50 m/s when a hunter fire
1. A 1.00-kg duck is flying horizontally overhead at 1.50 m/s when a hunter fires straight up. The 10-g bullet is moving vertically at a speed of 100 m/s when it hits the duck and…
1. A 1.0kg block is pushed a distance of 1.0m across a frozen lake by a constant
1. A 1.0kg block is pushed a distance of 1.0m across a frozen lake by a constant force. Starting from rest, the block attained a speed of 5m/s. How much further must the block be …
1. A 1.37 grams antacid tablet is added to 25.00 mL of 0.450 M HCl. After the re
1. A 1.37 grams antacid tablet is added to 25.00 mL of 0.450 M HCl. After the resulting reaction was complete, back titration required 10.4 mL of 0.1212 M NaOH. Assuming that the …
1. A 1.40 -kg object slides to the right on a surface having a coefficient of ki
1. A 1.40-kg object slides to the right on a surface having a coefficient of kinetic friction 0.250 (Figure a). The object has a speed of vi = 2.70 m/s when it makes contact with …
1. A 1.45 kg mass oscillates according to the equation x =0.700cos8.40 t , where
1. A 1.45 kg mass oscillates according to the equation x=0.700cos8.40t, where x is in meters and t is in seconds. PART A: Determine the amplitude. PART B: Determine the frequency.…
1. A 1.5 kg block is connected to a horizontal spring whose constant is 2.5 N/m.
1. A 1.5 kg block is connected to a horizontal spring whose constant is 2.5 N/m. The block is pulled to the right a distance of 4 cm and then released. a) What is the amplitude of…