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Questions (2,007)

A paperweight, when weighed in air, has a weight of W = 6.95 N. When completely immersed in water, however, it has a weight of
1. 1 answer
2. 783 views
The intensity (in W/m2) of one sound is 4.83 times as great as the intensity of another sound. Relative to the quieter sound,
1. 2 answers
2. 687 views
A satellite has a mass of kg orbits the Earth in a circular path with radius 1.0e^7m.What is the period of the satellite? I
1. 1 answer
2. 471 views
A football player kicks a ball with a speed of 25m/s at an angle of 40 degrees relative to the horizontal. Ignore air
1. 3 answers
2. 988 views
Vector A has a magnitude of 3.0 m and direction 1o3 degrees relative to the positive x-axis. Vector B has magnitude 5.0m and
1. 2 answers
2. 539 views
A source emits sound uniformly in all directions. There are no reflections of the sound. At a distance of 12 m from the source,
1. 1 answer
2. 4,744 views
A paperweight, when weighed in air, has a weight of W = 6.95 N. When completely immersed in water, however, it has a weight of
1. 3 answers
2. 2,380 views
An object is inside a room that has a constant temperature of 295 K. Via radiation, the object emits three times as much power
1. 1 answer
2. 1,218 views
A 0.0979-m x 0.215-m x 0.260-m block is suspended from a wire and is completely under water. What buoyant force acts on the
1. 1 answer
2. 739 views
An object is solid throughout. When the object is completely submerged in ethyl alcohol, its apparent weight is 15.8 N. When
1. 1 answer
2. 1,095 views
A system does 210 J of work on its environment and gains 80.6 J of heat in the process. Find the change in the internal energy
1. 1 answer
2. 692 views
Blood flows through a section of a horizontal artery that is partially blocked by a deposit along the artery wall. As a
1. 2 answers
2. 2,792 views
A system does 210 J of work on its environment and gains 80.6 J of heat in the process. Find the change in the internal energy
1. 1 answer
2. 992 views
A satellite of mass 500kg orbits the Earth in a circular path with radius 1.0e^7 m .1) What is the period of the satellite? I
1. 3 answers
2. 841 views
Solve for QQ= sin^-1 1.5/9.8 I got 8.80 Is this correct? I have a TI-30 calculator and to do the sin^-1 I pushed the 2nd button
1. 3 answers
2. 496 views
Vector A has a magnitude of 3.0 m and direction 1o3 degrees relative to the positive x-axis. Vector B has magnitude 5.0m and
1. 3 answers
2. 498 views
There is a rod that is split into two sections. The left side is copper with value of 390, temp of 100 degrees c and the length
1. 2 answers
2. 465 views
There is a PV diagram with ABC and the cycle is moving clockwise.segment AB is isobaric BC is isochronic AC cannot be determined
1. 1 answer
2. 535 views
There is a rod that is split into two sections. The left side is copper with value of 390, temp of 100 degrees c and the length
1. 0 answers
2. 447 views
A 0.33-kg metal sphere oscillates at the end of a vertical spring. As the spring stretches from 0.12 to 0.26 m (relative to its
1. 2 answers
2. 613 views
A uniform horizontal beam is attached to a vertical wall by a frictionless hinge and supported from below at an angle è = 38o
1. 1 answer
2. 1,013 views
A uniform horizontal beam is attached to a vertical wall by a frictionless hinge and supported from below at an angle è = 38o
1. 0 answers
2. 878 views
A spring stretches by 0.0226 m when a 4.39-kg object is suspended from its end. How much mass should be attached to this spring
1. 1 answer
2. 903 views
A spring stretches by 0.0226 m when a 4.39-kg object is suspended from its end. How much mass should be attached to this spring
1. 1 answer
2. 508 views
A uniform horizontal beam is attached to a vertical wall by a frictionless hinge and supported from below at an angle è = 38o
1. 1 answer
2. 827 views
Some bacteria are propelled by motors that spin hair-like flagella. A typical bacterial motor turning at a constant angular
1. 1 answer
2. 469 views
A uniform plank of length 5.0 m and weight 225 N rests horizontally on two supports, with 1.1 m of the plank hanging over the
1. 2 answers
2. 4,057 views
Some bacteria are propelled by motors that spin hair-like flagella. A typical bacterial motor turning at a constant angular
1. 1 answer
2. 492 views
A dentist causes the bit of a high-speed drill to accelerate from an angular speed of 1.44 x 104 rad/s to an angular speed of
1. 1 answer
2. 894 views
If dy/dx = (1 + x)/(xy), x>0, and y=-4 when x=1, then when x=3, y= what?
1. 3 answers
2. 1,108 views
A rectangular plate is rotating with a constant angular speed about an axis that passes perpendicularly through one corner, as
1. 2 answers
2. 8,820 views
A fan blade is rotating with a constant angular acceleration of +12.4 rad/s2. At what point on the blade, as measured from the
1. 1 answer
2. 1,945 views
A person is riding a bicycle, and its wheels have an angular velocity of 26.0 rad/s. Then, the brakes are applied and the bike
1. 1 answer
2. 802 views
After 14.6 s, a spinning roulette wheel has slowed down to an angular velocity of 1.22 rad/s. During this time, the wheel has an
1. 1 answer
2. 1,272 views
Three forces act on a hockey puck as it slides across the ice, and it is in equilibrium. The force F is applied at the center
1. 1 answer
2. 5,975 views
A 53-N crate is suspended from the left end of a plank. The plank weighs 21 N, but it is not uniform, so its center of gravity
1. 2 answers
2. 4,063 views
A person is riding a bicycle, and its wheels have an angular velocity of 26.0 rad/s. Then, the brakes are applied and the bike
1. 2 answers
2. 798 views
1)A 1180-kg van, stopped at a traffic light, is hit directly in the rear by a 753-kg car traveling with a velocity of +1.81 m/s.
1. 1 answer
2. 504 views
A car (mass = 1140 kg) is traveling at 27.3 m/s when it collides head-on with a sport utility vehicle (mass = 2380 kg) traveling
1. 1 answer
2. 1,301 views
1)A 1180-kg van, stopped at a traffic light, is hit directly in the rear by a 753-kg car traveling with a velocity of +1.81 m/s.
1. 0 answers
2. 472 views
A high-jumper clears the bar and has a downward velocity of -6.00 m/s just before landing on an air mattress. The mass of the
1. 1 answer
2. 2,897 views
Four very thin rods, each 8.3 m long, are joined to form a square. The center of mass of the square is located at the coordinate
1. 1 answer
2. 2,712 views
1) A man (mass = 80.9 kg) jumps straight down from a bridge into a boat (mass = 482 kg) in which a criminal is fleeing. The
1. 1 answer
2. 549 views
1) David has a mass of 86.4-kg and is skating with in-line skates. He sees his 24.8-kg younger brother up ahead standing on the
1. 1 answer
2. 582 views
1) A student, starting from rest, slides down a water slide. On the way down, a kinetic frictional force (a nonconservative
1. 1 answer
2. 5,086 views
A skier slides horizontally along the snow for a distance of 11.9 m before coming to rest. The coefficient of kinetic friction
1. 3 answers
2. 669 views
1) A roller coaster (398 kg) moves from A (3.82 m above the ground) to B (29.4 m above the ground). Two non-conservative forces
1. 3 answers
2. 634 views
A water-skier is being pulled by a tow rope attached to a boat. As the driver pushes the throttle forward, the skier
1. 3 answers
2. 1,094 views
1) A roller coaster (398 kg) moves from A (3.82 m above the ground) to B (29.4 m above the ground). Two non-conservative forces
1. 2 answers
2. 809 views
A skier slides horizontally along the snow for a distance of 11.9 m before coming to rest. The coefficient of kinetic friction
1. 2 answers
2. 543 views
A student, starting from rest, slides down a water slide. On the way down, a kinetic frictional force (a nonconservative force)
1. 3 answers
2. 1,747 views
A 12-kg crate is pushed up an incline from point A to point B. What is the change in the gravitational potential energy of the
1. 1 answer
2. 6,006 views
a rollar coaster is 80m high and has a 50kg car at rest. Ignore air resistance and friction.If the speed of the car is 60m/s
1. 6 answers
2. 951 views
1) A 1320 kg demolition ball swings at the end of a 34.3 m cable on the arc of a vertical circle. At the lowest point of the
1. 3 answers
2. 634 views
A jet flying at 106 m/s banks to make a horizontal circular turn. The radius of the turn is 3810 m, and the mass of the jet is
1. 1 answer
2. 1,188 views
1) A box is sliding up an incline that makes an angle of 14.0 ° with respect to the horizontal. The coefficient of kinetic
1. 1 answer
2. 995 views
A golfer hits a shot to a green that is elevated 3.0 m above the point where the ball is struck. The ball leaves the club at a
1. 1 answer
2. 621 views
A golfer, standing on a fairway, hits a shot to a green that is elevated 5.33 m above where she is standing. If the ball leaves
1. 1 answer
2. 1,262 views
A golfer hits a shot to a green that is elevated 3.0 m above the point where the ball is struck. The ball leaves the club at a
1. 3 answers
2. 558 views
A 79.2-kg person stands on a scale in an elevator. What is the apparent weight when the elevator is (a) accelerating upward with
1. 4 answers
2. 1,965 views
A golfer hits a shot to a green that is elevated 3.0 m above the point where the ball is struck. The ball leaves the club at a
1. 0 answers
2. 576 views
A hot-air balloon is rising upward with a constant speed of 2.45 m/s. When the balloon is 3.22 m above the ground, the
1. 2 answers
2. 665 views
1) A cave explorer drops a stone from rest into a hole. The speed of sound is 343 m/s in air, and the sound of the stone
1. 2 answers
2. 780 views
1) A baby elephant is stuck in a mud hole. To help pull it out, game keepers use a rope to apply a force FA. By itself, however,
1. 3 answers
2. 3,708 views
A pilot flies her route in two straight-line segments. The displacement vector A for the first segment has a magnitude of 254 km
1. 1 answer
2. 3,366 views
1) A jetliner, traveling northward, is landing with a speed of 69.3 m/s. Once the jet touches down, it has 787 m of runway in
1. 1 answer
2. 670 views
Determine the final speed assuming that the time elapsed since t=0 is 2.4s.Initial velocity is +12m/s acceleration is +3.4m/s^2
1. 2 answers
2. 447 views
1) The velocity of a diver just before hitting the water is -11.8 m/s, where the minus sign indicates that her motion is
1. 3 answers
2. 2,659 views
1) A cave explorer drops a stone from rest into a hole. The speed of sound is 343 m/s in air, and the sound of the stone
1. 3 answers
2. 1,024 views
1) A penny is dropped from rest from the top of a very tall building. Assuming the height of the building is 407 m and ignoring
1. 1 answer
2. 968 views
1) two hot-air balloons are 48.2 m and 61.0 m above the ground. A person in the left balloon observes that the right balloon is
1. 4 answers
2. 9,060 views
1)A force vector points at an angle of 12.4 ° above the +x axis. It has a y component of +337 newtons (N). Find the magnitude
1. 1 answer
2. 958 views
1) A force vector has a magnitude of 579 newtons and points at an angle 43o of below the positive x axis.Find the x scalar
1. 1 answer
2. 1,586 views
A football is kicked with a speed of 18 m/s at an angle of 65° to the horizontal.How long is the football in the air? Neglect
1. 2 answers
2. 5,383 views
1) Which components remain constant throughout the motion?vx = x component of the velocity vy = y component of the velocity ax =
1. 1 answer
2. 361 views
There is a diagram of a ball being thrown in a horizontal diection at 30m/s and there is an angle of 48degrees and a side with
1. 1 answer
2. 407 views
An insurance company checks police records (in a city) on 500 accidents selected atrandom and notes that teenagers were at the
1. 31 answers
2. 747 views
Integrate e^((x^3)/2)How do I start? I know that the integral of e^x is just e^x plus C, but what do I do with the ((x^3)/2)?
1. 1 answer
2. 327 views
1) Which components remain constant throughout the motion?vx = x component of the velocity vy = y component of the velocity ax =
1. 0 answers
2. 930 views
Evaluate definite integral from -2 to 0.Integral((x^2)(e^((x^3)/2)dx) Do those parentheses make sense? The power of e is x^3
1. 0 answers
2. 413 views
Why do chloride ions increase corrosion?
1. 1 answer
2. 495 views
Vector A has magnitude of 9.77 units and points due east. Vector B points due north.1) What is magnitude of B, if the vector A+B
1. 2 answers
2. 602 views
Which equations are dimensionally correct?F=ma E=max X=(1/2)at^3 V=sqrt(2*fx/m) E=(1/2)mv I think that F=ma , E=(1/2)at^3,
1. 1 answer
2. 2,604 views
A force, F1 of magnitude 2.0N and directed due east is exerted on an object is F2=2.0N due north. What is the magnitude and
1. 4 answers
2. 2,231 views
The circumference of the front tire is 6ft. How many complete turns does the front wheel make in 30 ft driveway?
1. 1 answer
2. 894 views
Compute:The number of combinations of 8 elements taken 3 at a time. The number of permutations of 8 elements taken 3 at at time.
1. 1 answer
2. 565 views
A 5-kg ball is thrown straight up in the air with an initial speed of 24m/s. After its release and before it hits the ground
1. 6 answers
2. 939 views
Two vectors have magnitudes 4m and 3m. Which choice is not a possible magnitude for their resultant?3m, 1m, 7m, 12m I chose 12m.
1. 3 answers
2. 1,222 views
Vector A has a magnitude 2.4m and direction 130 degrees relative to the positive x-axis. Vector B has magnitude 3.0m and
1. 3 answers
2. 1,030 views
One bag contains 5 red marbles, 4 blue marbles, and 3 yellow marbles, and a second bag contains 4 red marbles, 6 blue marbles,
1. 5 answers
2. 1,934 views
A patient with untreated diabetes may have a blood concentration of acetone of 20mg/100mL. Determine the molar mass of acetone
1. 1 answer
2. 420 views
Calculate the concentration of HCO3- in an aqueous solution of 0.0885 M carbonic acid, H2CO3 (aq).I was going to set this up as
1. 3 answers
2. 748 views
A 23.9 mL sample of 0.283 M trimethylamine, (CH3)3N, is titrated with 0.207 M hydrochloric acid.At the equivalence point, the pH
1. 5 answers
2. 699 views
What is the molar solubility of barium phosphate in a 0.282M barium acetate solution?If I set up and ice table I would have
1. 1 answer
2. 1,202 views
delta Go = -431.16kJ/mol - (298k X 0.12529 kJ/K*mol)I am having trouble converting the units for delta H and delta s to match. I
1. 1 answer
2. 594 views
What is the molar solubility of barium phosphate in a 0.282M barium acetate solution?If I set up and ice table I would have
1. 1 answer
2. 626 views
delta Go = -431.16kJ/mol - (298k X 0.12529 kJ/K*mol)I am having trouble converting the units for delta H and delta s to match. I
1. 4 answers
2. 480 views
1) Nitrosyl chloride (NOCl) decomposes at high temperature. The equation is2 NOCl (g) -> 2 NO (g) + Cl2 (g) at 227oC Using delta
1. 3 answers
2. 681 views
1) Nitrosyl chloride (NOCl) decomposes at high temperature. The equation is2 NOCl (g) -> 2 NO (g) + Cl2 (g) at 227oC Using delta
1. 2 answers
2. 985 views
I need to calculate the value of Kp at 25 degrees celsius using the delta Go value.Delta Go = -29.10kJ I know that Delta Go =
1. 0 answers
2. 405 views

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