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Questions (37)

how do you do-11(--5x =16 =616
1. 1 answer
2. 143 views
why do you find the same wavelengths and colors on each side of the central maxima?
1. 1 answer
2. 611 views
Unpolarized light is incident on four polarizing sheets with their transmission axes oriented as shown in the figure, in which
1. 1 answer
2. 1,429 views
Two concentric circular wire loops in the same plane each carry a current. The larger loop has a current of 8.62 A circulating
1. 1 answer
2. 965 views
Consider the circuit in the diagram. Let R1 = 51.0 Ω, R2 = 38.0 Ω, R3 = 74.0 Ω, R4 = 16.0 Ω, and V = 84 V.(b) What current
1. 1 answer
2. 669 views
A horizontal beam of electrons initially moving at 4.3 107 m/s is deflected vertically by the vertical electric field between
1. 0 answers
2. 667 views
A town is planning on using the water flowing through a river at a rate of 4.9 106 kg/s to carry away the heat from a new power
1. 2 answers
2. 1,018 views
A reversible engine with an efficiency of 32.0% has TC = 304.0 K.(a) What is TH? (b) How much heat is exhausted for every 0.138
1. 1 answer
2. 466 views
A 10.9-g iron bullet with a speed of 4.00 102 m/s and a temperature of 20.0° C is stopped in a 0.400-kg block of wood, also at
1. 2 answers
2. 1,478 views
A 30.0-g lead bullet leaves a rifle at a temperature of 89.0° C and hits a steel plate. If the bullet melts, what is the
1. 2 answers
2. 744 views
A 0.600-kg aluminum teakettle contains 4.00 kg of water at 26.0° C. How much heat is required to raise the temperature of the
1. 1 answer
2. 610 views
What is the total translational kinetic energy of the gas molecules of 0.470 mol of air at atmospheric pressure that occupies a
1. 1 answer
2. 531 views
A cylinder in a car engine takes Vi = 4.50 10-2 m3 of air into the chamber at 30° C and at atmospheric pressure. The piston
1. 1 answer
2. 1,905 views
Calculate the number of H2O molecules in a human body of mass 66.5 kg. Assume that, on average, water makes up 62% of the mass
1. 2 answers
2. 779 views
A sound wave with intensity 37 mW/m2 interferes constructively with a sound wave that has an intensity of 18 mW/m2. What is the
1. 1 answer
2. 538 views
An experimental flywheel, used to store energy and replace an automobile engine, is a solid disk of mass 202.0 kg and radius
1. 1 answer
2. 841 views
A modern sculpture has a large horizontal spring, with a spring constant of 277 N/m, that is attached to a 58.0-kg piece of
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2. 603 views
A uniform disk with a mass of 900 g and radius 17.0 cm is rotating on frictionless bearings with an rotational speed of 18.0 Hz
1. 1 answer
2. 601 views
A weightless rod, with length d = 5.5 m, supports three weights with masses m1 = 3 kg, m2 = 14 kg, and m3 = 4 kg as shown. Where
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2. 472 views
How much work is done by the motor in a CD player to make a CD spin, starting from rest? The CD has a diameter of 12.8 cm and a
1. 0 answers
2. 551 views
A 0.01-kg baseball traveling in a horizontal direction with a speed of 11 m/s hits a bat and is popped straight up with a speed
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2. 1,245 views
A projectile of mass 2.0 kg approaches a stationary target body at 4.9 m/s. The projectile is deflected through an angle of
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2. 514 views
A 60-kg astronaut is in space, far from any objects that would exert a significant gravitational force on him. He would like to
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2. 505 views
A block of wood of mass 0.86 kg is initially at rest. A bullet of mass 0.048 kg traveling at 102.3 m/s strikes the block and
1. 1 answer
2. 630 views
A uranium nucleus (mass 238 u), initially at rest, undergoes radioactive decay. After an alpha particle (mass 4.0 u) is emitted,
1. 1 answer
2. 790 views
What is the momentum of an automobile (weight = 9600 N) when it is moving at 38 m/s to the south?
1. 1 answer
2. 467 views
A hang glider moving at speed 9.0 m/s dives to an altitude 4.2 m lower. Ignoring drag, how fast is it then moving?
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2. 938 views
A motorist driving a 1100-kg car on level ground accelerates from 20.0 m/s to 30.0 m/s in a time of 5.6 s. Neglecting friction
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2. 436 views
A 2.9-kg block is released from rest and allowed to slide down a frictionless surface and into a spring. The far end of the
1. 0 answers
2. 885 views
A 528 kg automobile is moving at 20.4 m/s at a height of 5.0 m above the bottom of a hill when it runs out of gasoline. The car
1. 1 answer
2. 552 views
A spacecraft is in orbit around a planet. The radius of the orbit is 3.2 times the radius of the planet (which is R = 71490 km).
1. 0 answers
2. 456 views
A car that is initially at rest moves along a circular path with a constant tangential acceleration component of 2.07 m/s2. The
1. 0 answers
2. 879 views
A cyclist starts from rest and pedals so that the wheels make 8.1 revolutions in the first 5.4 s. What is the angular
1. 0 answers
2. 639 views
A child pushes a merry go-round from rest to a final angular speed of 0.44 rev/s with constant angular acceleration. In doing
1. 0 answers
2. 675 views
A 31.5-kg child swings on a rope with a length of 6.26 m that is hanging from a tree. At the bottom of the swing, the child is
1. 0 answers
2. 521 views
A biologist is studying growth in space. He wants to simulate Earth's gravitational field, so he positions the plants on a
1. 0 answers
2. 929 views
Grace is playing with her dolls and decides to give them a ride on a merry-go-round. She places one of them on an old record
1. 1 answer
2. 527 views

Answers (3)

Between low tide and high tide, the width of a beach changes by −17 feet per hour. Write and evaluate an expression to show how much the width of the beach changes in 3 hours. I need help?
Two turtles are competing in a race. Turtle A reaches the finish line in 137 hours. Turtle B finished in 125 hours. Which turtle had the faster time?
thank you...what I originally did was use the wrong specific heat for iron.

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