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Questions and answers by physics, page 2

Questions (197)

Two identical traveling waves, moving in the same direction, are out of phase by /5.0 rad. What is the amplitude of the
1. 2 answers
2. 598 views
A linear charge of nonuniform density �(x) = 5.2 x C/m, is distributed along the x-axis from 4.9 m to 6 m. Determine the
1. 1 answer
2. 606 views
A charge of 10.104 nC is uniformly distributed along the x-axis from −1 m to 1 m.What is the electric potential (relative to
1. 1 answer
2. 1,077 views
Initially (at time t = 0) a particle is moving vertically at 5.8 m/s and horizontally at 0 m/s. Its horizontal acceleration is
1. 3 answers
2. 1,372 views
Particle 1 is moving on the x-axis with an acceleration of 5.55 m/s2 in the positive x-direction. Particle 2 is moving on the
1. 1 answer
2. 678 views
A place kicker must kick a football from a point 36 m (about 39 yd) from the goal, and the ball must clear the crossbar, which
1. 4 answers
2. 2,545 views
The electric potential in a certain region is V = a x2 + b x + c, where a = 15 V/m2, b = −13 V/m, and c = 67 V.1)Determine the
1. 3 answers
2. 852 views
A linear charge of nonuniform density �E(x)=bx C/m, where b = 5.2 nC/m2, is distributed along the x-axis from 4.9 m to 6 m.Deter
1. 1 answer
2. 1,086 views
Initially (at time t = 0) a particle is moving vertically at 5.8 m/s and horizontally at 0 m/s. Its horizontal acceleration is
1. 4 answers
2. 675 views
A force ~F = Fx ˆı+Fy ˆ| acts on a particle thatundergoes a displacement of ~s = sx ˆı + sy ˆ| where Fx = 10 N, Fy = −1
1. 1 answer
2. 1,189 views
A boat moves through the water with twoforces acting on it. One is a 2.80×10 3 N forward push by the motor, and the other is a
1. 1 answer
2. 451 views
A uniform 7.1 m tall aluminum ladder is leaning against a frictionless vertical wall. The ladder has a weight of 272 N. The
1. 2 answers
2. 1,035 views
The systemis in equilibrium and the pulleysare frictionless and massless. |_________________________| l l l ( . ) l / \ | / \ (
1. 2 answers
2. 1,098 views
What is the resulting temperature when a 150g cube of ice at zero degrees is added to 200g of water in a aluminium cup at 30
1. 1 answer
2. 454 views
Three point charges, A = 2.2 µC, B = 7.5 µC, and C = -3.9 µC, are located at the corners of an equilateral triangle . Find
1. 2 answers
2. 895 views
In an electric field described by E = (20i+60j) V/m calculate the change in potential for a particle that moves from the origin
1. 1 answer
2. 338 views
What is the potential halfway between two point charges spaced 1 mm apart if q1=10 micro culumbs and q2= -5 micro culumbs
1. 3 answers
2. 601 views
from which equations is the following equation derived from:length=(time^2 * g)/4
1. 1 answer
2. 730 views
In an arcade game a 0.135 kg disk is shotacross a frictionless horizontal surface by compressing it against a spring and
1. 1 answer
2. 568 views
A car with a mass of 3200 kg and a velocity of 50 m/s brakes to a final velocity of 25m/s in a distance of 85 m. what is the
1. 1 answer
2. 450 views
A roller-coaster car has a mass of 1100 kg when fully loaded with passengers. As the car passes over the top of a circular hill
1. 2 answers
2. 857 views
Two wires parallel to each other and separated by a distance d carry different currents; they exert a force with magnitude F on
1. 1 answer
2. 642 views
a machine gun can fire 20 bullet persecond if speed of bullet is 100m/s and if each bullet weight 100grams calcuate force
1. 1 answer
2. 1,156 views
what does velocity mean in physics?
1. 1 answer
2. 311 views
If 2.00 X 10^20 electrons move through a pocket calculator during a full day's operation, how many coulombs of charge moved
1. 3 answers
2. 964 views
Four identical metallic spheres with charges of +2.2 µC, +8.2 µC, −4.6 µC, and −9.2 µC are placed on a piece of paper.
1. 1 answer
2. 672 views
When a parachute opens, the air exerts a large drag force on it. This upward force is initially greater than the weight of the
1. 2 answers
2. 875 views
A current flows in a wire of circular cross-section with the free electrons travelling with a mean drift velocity v. If an equal
1. 4 answers
2. 869 views
A spectral line is emitted when an atom undergoes tranisition between two levels with a difference in energy of 2.4eV.What is
1. 4 answers
2. 619 views
Two protons in a molecule are 3.80 multiplied by 10-10 m apart. Find the electrical force exerted by one proton on the other.Mag
1. 2 answers
2. 794 views
A rod 14.0 cm long is uniformly charged and has a total charge of -20.0 µC. Determine the magnitude and direction of the
1. 1 answer
2. 739 views
Two protons in a molecule are 3.80 multiplied by 10-10 m apart. Find the electrical force exerted by one proton on the other.Mag
1. 1 answer
2. 620 views
A rod 14.0 cm long is uniformly charged and has a total charge of -20.0 µC. Determine the magnitude and direction of the
1. 1 answer
2. 706 views
A rod 14.0 cm long is uniformly charged and has a total charge of -20.0 µC. Determine the magnitude and direction of the
1. 1 answer
2. 827 views
Two protons in a molecule are 3.80 multiplied by 10-10 m apart. Find the electrical force exerted by one proton on the other.Mag
1. 1 answer
2. 1,142 views
An air-filled capacitor consists of two parallel plates, each with an area of 7.60 cm2, separated by a distance of 1.70 mm.(a)
1. 1 answer
2. 471 views
A toy rocket is launched at an initial velocity of 50 m/s at an angle of 75° with the horizontal. Write parametric equations to
1. 2 answers
2. 967 views
How much heat is added to 10.5 g of ice at -20.0°C to convert it to steam at 123.5°C?
1. 3 answers
2. 635 views
How would you design a black body?
1. 1 answer
2. 451 views
A cannon ball is fired horizontally with a velocity of 50m/s from the top of a cliff of 90mh. after how many seconds will it
1. 2 answers
2. 615 views
When a wave crosses a boundary between a thin and a thick rope, its frequency changes, but its wavelength and speed do not. True
1. 4 answers
2. 998 views
Determine whether each of the following statements is true or false.A concave mirror never forms an enlarged real image of a
1. 1 answer
2. 779 views
A real object is placed in front of a diverging lens, at a distance less than the focal length. When the object is moved
1. 1 answer
2. 734 views
what is the electric force exerted on a test charge of 3.86 x 10^-5 C if it is placed in an electric field of magnitude 1.75 x
1. 3 answers
2. 541 views
find the resistance of 134m of No.20 copper wire at 20 degrees C (p=1.72x10^-6Ohom cm , A= 2.07x10^-2 cm ^2)
1. 2 answers
2. 520 views
Consider a particle with mass m bound to a potential v(x) = k^2|x|. Using the WKBquantization condition, find the energy
1. 1 answer
2. 314 views
the resultant of two forces 13n and 20 n is f if the first forces is doubled the resultant is also doubled to 2f find the angle
1. 1 answer
2. 500 views
An airplane pilot wishes to fly due west. A wind of 90.0 km/h is blowing toward the south.If the airspeed of the plane (its
1. 1 answer
2. 1,153 views
A tire 0.50meter in radius rotates at aconstant rate of 200 revolution per minute .find the speed & accelaration of asmall stone
1. 1 answer
2. 431 views
Assume a cyclist of weight mg can exert a force on the pedals equal to 0.90 mg on the average. If the pedals rotate in a circle
1. 2 answers
2. 972 views
A rock weighs 100 N in air and has a volume of 0.00312 m^3.What is its apparent weight when submerged in water? The acceleration
1. 2 answers
2. 576 views
In an archery practice an arrow was realesed from a bow with a velocity of 20m/s it strikes and slopes find at what rate the
1. 2 answers
2. 546 views
a stone weighing 0.2kg tied to the end of the string 0.6m long whorld in a horizontal circle in a speed of 150 revolutions per
1. 2 answers
2. 612 views
A soccer ball was kicked off a cliff that was h = 8.4 m above the ground. The ball was kicked at a speed of 25 m s-1 and an
1. 2 answers
2. 501 views
A soccer ball was kicked off a cliff that was h = 8.4 m above the ground. The ball was kicked at a speed of 25 m s-1 and an
1. 2 answers
2. 560 views
A stone of 2kg is projecter vertically as a velocity of 5m/s at an angle of 60.calculate,the time taking?the maximum hight?the
1. 1 answer
2. 414 views
A 60kg boy climbs 70 fligts of stairs each 20cm high in one minute how much powers is developed?
1. 2 answers
2. 605 views
If A=4i+3j-2k, B=8i+6j-4k then the angle would be?
1. 2 answers
2. 632 views
Physics QuestionTwo toy ducks, attached to each other by a string, are being pulled by a very happy guy who just got them as a
1. 4 answers
2. 2,200 views
using dimention show that 1joile =10 eag
1. 1 answer
2. 334 views
Scientists want to place a 3100 kg satellite in orbit around Mars. They plan to have the satellite orbit a distance equal to 1.9
1. 3 answers
2. 897 views
mmars = 6.4191 x 1023 kgrmars = 3.397 x 106 m G = 6.67428 x 10-11 N-m2/kg2 3100 kg 1.9 times radius of mars What speed should
1. 2 answers
2. 687 views
Scientists want to place a 3100 kg satellite in orbit around Mars. They plan to have the satellite orbit a distance equal to 1.9
1. 2 answers
2. 1,156 views
A runner follows a straight line path. He reaches the 100m mark with a velocity of 2.29m/s, then slows down steadily
1. 1 answer
2. 395 views
A piece of aluminum is made with a cavity inside the aluminum. To find the volume of the cavity the piece of aluminum is
1. 3 answers
2. 1,268 views
What Is The Equvalent Resistance Of Two Resistor Are 2and3ohm connected in paralle each resistor
1. 1 answer
2. 362 views
A schematic of a simple electrical circuit consisting of a resistor and an inductor is shown in the figure. The current I at
1. 1 answer
2. 462 views
Modern gasoline engines have a maximum thermal efficiency of about 20% to 35% when used to drive a car. Although the gasoline
1. 1 answer
2. 417 views
air parcel A has an air temperature of 5℃ and an absolute humidity of 5g/m^-3. What is its relative humidity and dew point
1. 1 answer
2. 441 views
calculate the geostrophic wind velocity:- coriolis parameter is: 1x10^-4 s^-1 = 0.0001s^-1 - height gradient on the 500hPa
1. 1 answer
2. 275 views
Ohm's Law, ΔV = I • R, can be rewritten several ways. Which of the following is an incorrect way to rewrite Ohm's Law?I = ΔV
1. 4 answers
2. 341 views
We have used analogies with Newton's Laws to help us understand the behavior of electricity. Which of the following is the best
1. 3 answers
2. 539 views
Ohm's Law, ΔV = I • R, can be rewritten several ways. Which of the following is an incorrect way to rewrite Ohm's Law?I = ΔV
1. 1 answer
2. 310 views
Ohm's Law, ΔV = I • R, can be rewritten several ways. Which of the following is an incorrect way to rewrite Ohm's Law?I = ΔV
1. 1 answer
2. 371 views
Ohm's Law, ΔV = I • R, can be rewritten several ways. Which of the following is an incorrect way to rewrite Ohm's Law?I = ΔV
1. 1 answer
2. 350 views
The diagram below depicts three different circuits that light a bulb. The batteries are identical 1.5 V cells, and the light
1. 4 answers
2. 614 views
Each battery is a 1.5 V cell. If the current in circuit 2 is 3 amperes (3 A), what is the voltage drop across the light bulb for
1. 2 answers
2. 704 views
Each battery is a 1.5 V cell. If the resistance of the bulb in circuit 3 is 1 ohm (Ω), what is the current passing through the
1. 3 answers
2. 519 views
Consider five vectors a, b, c, d and e. Is it true or false that their addition always results in a vector with a greater
1. 4 answers
2. 908 views
a clerk moves a box of cans down an aisle by pulling on a strap attached to the box. The clerk pull with a force of 185.0 N at
1. 1 answer
2. 416 views
4. An airplane has an air velocity of 200 m/s [W]. The wind velocity relative to the ground is 60 m/s [N].a. Determine the
1. 1 answer
2. 517 views
A worker must move a crate that can be either pushed at a slight downward angle of 25° or pulled at a slight upward angle of
1. 6 answers
2. 241 views
A block-and-pulley system is set up as shown in the diagram below. The coefficient of friction between the 1.00 kg block and the
1. 1 answer
2. 226 views
A block-and-pulley system is set up as shown in the diagram below. The coefficient of friction between the 1.00 kg block and the
1. 1 answer
2. 266 views
A block-and-pulley system is set up as shown in the diagram below. There is no friction between the 2 kg and 3 kg blocks, but
1. 3 answers
2. 295 views
A sled of mass 30 kg is at rest on a hill that is inclined at 25° to the horizontal; the coefficient of friction between the
1. 4 answers
2. 254 views
A roller coaster cart of mass 300 kg (including passengers) is moving at 20 m/s at point A and 5 m/s at point B. What is the
1. 1 answer
2. 308 views
A potato salesman has set up a bootleg potato shop inside an elevator. He sells his potatoes by placing them on a spring scale
1. 3 answers
2. 329 views
a girl walk 10m, west and 15m, east, what is the displacement
1. 2 answers
2. 91 views
In most electric power plants, magnets are moved through a coil of wire. This causes current to flow through the wire. The
1. 1 answer
2. 86 views
Which of these would be LEAST useful if one is attempting to create a electromagnet?A: distilled water B: battery C: coil of
1. 1 answer
2. 54 views
What generates the magnetic field that surrounds a wire carrying an electric current?A: motion of electrons in the wire B:
1. 1 answer
2. 78 views
Braddy connected the loose wire to the battery and created an electromagnet. He picked up 45 thumb tacks with his electromagnet,
1. 1 answer
2. 96 views
Each step in the generation, transmission and distribution of electricity requires the use of what physics concept?A: electrical
1. 1 answer
2. 75 views
A transformer is used to step up or down the voltage in power lines. It uses two coils that are near but not connect to each
1. 1 answer
2. 94 views
1) Why are dosimeters useful to medical personnel treating a person exposed to acute radiation?A: They predict the severity of
1. 1 answer
2. 108 views
Two Mississippi companies, Howard Industries and Kuhlman Electric Company, are responsible for most of the transformers and
1. 1 answer
2. 132 views

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