# Homework Help: Science: Physics

## Recent Homework Questions About Physics

**physics**

1. A cylinder tank is 30m deep,calculate the pressure extended at the bottom of the tank,when it is four-fifth filled with water (g=10mg-2,density of water =1000kgm-2) 2.a sample of air weighing 1.32*10^2N is confined in a room measuring 9.5m*2.0m.calculate the density of the ...

**physics**

What is the density of a fuel of relative density 0.72

**physics**

The index of refraction of water for a given monochromatic light in water is n=4/3. The wavelength of this light in water is 500nm. a) find the speed of this light in water. b) find the energy of one photon of this light . Does this enerdy change if this light is propagated in...

**physics**

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 electric field along the axis of the rod at a point 36.0 cm from its center. N/C

**Physics**

Two forces are applied to a block of mass MM=12.0 kg that sits on a horizontal, frictionless table. One force F⃗ 1F→1 has a magnitude of 10.0 N and is directed at an angle θ1 equal to 37.0° from the xx direction as labeled in the figure below. As a result of the forces, ...

**Physics**

A box (mass=34kg) is set on an incline (angle=36.5 degrees), attached to a string. The box is let go slowly with a tension of 205N on the string, and starts sliding down with an acceleration of 0.12m/s^2. What was the coefficient of kinetic friction between the box and the ...

**Physics Word Problem**

suppose a meteorite called head on with mars and becomes buried under mars surface. what would be the elasticity of this collision? explain your answer.

**physics**

the human body can survive a negative acceleration trauma incident if the magnitude of the acceleration is 250m/sq. s. If you are in an automobile accident with an initial velocity of 29.17 m/s and are stopped by an airbag that inflates from the dashboard, over what distance ...

**Physics**

Sputnik, the first artificial satellite to orbit the Earth, had a mass of 83.6kg and travelled at 7574 m/s. The radius of the earth is 6371 km and its mass is 5.972 x 10^24 kg. What gravitational force did Sputnik apply to the earth during this orbit? What I've got so far: so...

**physics**

The pitcher throws a pitch from the mound toward home plate 18.4m away. The ball is released horizontally from a height of 1.8m with a velocity of 32m/s. Find the height above ground when it gets there.

**physics**

A large box of mass M is pulled across a horizontal, frictionless surface by a horizontal rope with tension T. A small box of mass m sits on top of the large box. The coefficients of static and kinetic friction between the two boxes are μs and μk, respectively. Find an ...

**Physics**

write an equation that relates to frequency(f) applied to the string to the length(L) between the two fixed end points. This was from lab of standing waves.

**Physics**

Davi Kent caldoza is riding the Giant Drop at great America. If Davi Kent free falls for 3.6 seconds, what will be his final velocity and how far will he fall?

**Physics**

A stone is thrown vertically upward with the velocity of 49.0 m/s. (a) how high will it travel before it starts to fall? (b) how many seconds will it take the stone to reach the highest point?

**Physics**

A Ball of Mass 0.5kg Moving At 10m/s Collide With Another Ball Of Equal mass At Rest.If The Two Balls Move Together After The Impact Calculate Their common Velocity

**physics**

A particle (mass = 5.0 g, charge = 40 mC) moves in a region of space where the electric field is uniform and is given by Ex = -5.5 N/C, Ey = Ez = 0. If the position and velocity of the particle at t = 0 are given by x = y = z = 0 and vx = 50 m/s, vy = vz = 0, what is the ...

**Physics**

A wet bar of soap slides freely down a ramp 17.0 m long, inclined at 38.0 degrees. How long (in seconds) does it take to reach the bottom? (Neglect friction.)

**Physics**

An electric heater the temperature of 120g of water in a thin light vessel through 10k in 2 minutes, when placed in 70g of water contained in a metal vessel of mass 0.55kg the temperature rises through 9k in the same time. Calculate from the above The heat supplied in 2 ...

**physics**

Starting from rest, a student pulls a (34) kg box a distance of (13.50) m across the floor using a (161) N force applied at 35.0 degrees above horizontal. The coefficient of kinetic friction is 0.220 between the floor and the box. Find the work done by the pulling force. Give ...

**physics**

A 22.0 kg box is sliding down on an incline set at (44) degrees up from horizontal. The coefficient of kinetic friction between the box and the incline is (.27). Find the acceleration of the box. Give your answer in m/s2 and with 3 significant figures.

**Physics**

A cubic block initially at rest slides with a constant acceleration on an inclined plane 10m long in 2s. Calculate the acceleration of the block.

**physics**

A flying-saucer shaped fairground ride is rotating in a horizontal plane. If the rider’s circular path has a radius of 8 m, at how many revolutions per minute the ride should spin in order for the rider to feel a centripetal acceleration of about 1.5 times Earth’s ...

**physics**

A 10kg box is attached to a 7kg box which rests on a 30 degrees incline the coeficient of kinetic friction is mk=0.1 between the box and surface find the rate of acceleration of the system

**physics**

A ‘moving sidewalk’ in an airport terminal moves at 1 m/s and is 35 m long. If a woman steps on at one end and walks 1.5 m/s relative to the sidewalk, in the same direction as the movement of sidewalk. (a) How much time does it take her to reach the opposite end? 14s (b) ...

**Physics**

When a mass is hung from a spring stretches it by 15 cm. What is the period of the oscillations of this system?

**Physics**

an object weighing 200 lbs. and suspended by a rope A is pulled asisde by the horizontal rope B and held so that rope A makes an angle of 30 degree with the vertical. find the tensions in rope A and B.

**Physics**

The electric field from an infinitely large and uniformly charged sheet is independent of the distance from the sheet, yet the individual charges in the sheet all produce fields that object the inverse square law. Why doesn't the field get weaker at greater distances?

**physics**

A car travelling at 25 m/s slams its break leaving skids marks along a distance 125 m as it comes to rest. the coefficient f friction between the tire and the road is a 5 b 2.5 c 1 2 .4 e .25 A 500N worker pulling a 500 N crate on a rope with a force of 50 N at a constant ...

**Physics**

which of the following is NOT true about the path of a cannon ball launched horizontally from the earth's surface if air resistance is neglected? a. the cannnonball has a uniform horizontal velocity b.the total velocity of the cannon ball increases as a function of time c.the ...

**physics**

An electron in a cathode-ray tube is traveling horizontally at 2.10×109 cm/s when deflection plates give it an upward acceleration of 5.40×1017 cm/s2 . How long does it take for the electron to cover a horizontal distance of 6.30 cm ?What is its vertical displacement during ...

**physics**

What is the magnitude of your total displacement if you have traveled due west with a speed of 23 m/s for 125 s , then due south at 12 m/s for 255 s ? 2sf What is the direction of your total displacement in part A.

**physics**

In a friendly game of handball, you hit the ball essentially at ground level and send it toward the wall with a speed of 17 m/s at an angle of 39 ∘ above the horizontal. How long does it take for the ball to reach the wall if it is 3.8 m away? How high is the ball when it ...

**Physics**

What happens to the location of the image when the radius of curvature changes? I think it moves farther away when the curvature increases.

**physics**

A soccer ball is kicked with a speed of 16.7 m/s at an angle of 45.0 ∘ above the horizontal.If the ball lands at the same level from which it was kicked, for what amount of time was it in the air?

**physics**

IP A white-crowned sparrow flying horizontally with a speed of 1.70 m/s folds its wings and begins to drop in free fall How far does the sparrow fall after traveling a horizontal distance of 0.400 m

**physics**

An electron in a cathode-ray tube is traveling horizontally at 2.10×109 cm/s when deflection plates give it an upward acceleration of 5.40×1017 cm/s2 .How long does it take for the electron to cover a horizontal distance of 6.30 cm ? What is its vertical displacement during ...

**physics**

The Earth is 150 million km from the sun. It completes one orbit in a period of approximately 365.25 days. Calculate the orbital speed of Earth in km/hour. please helpppp

**Physics**

A 71 kg skydiver jumps out of a plane at an altitude of 1370m. She reaches terminal velocity of 68m/s. She opens the parachute at an altitude of 328m, and lands with a speed of 2.8m/s. a)How much (negative) work is done by air resistance before she opens the chute? b)How much ...

**Physics**

A stone is dropped from a hot air balloon that is rising at a constant speed of 2.2 m/s. If the stone takes 4.8 seconds to reach the ground then … a) What was the height of the balloon at the moment the stone was released? b) What is the height of the balloon at the time the...

**Thermal physics**

Explain thermal physics in details

**Physics**

A 50 ohm resistor consists of a copper portion joined to carbon portion, the resistance of the resistor being the sum of the resistance for 2 portions. Find the resistance of the copper portion of the resistor so that the combined resistance will be constant at all temperature.

**physics**

Last one! Thankyou for the help thus far... calculate the KE in kJ of 9.100 x 10^5 atoms of silver moving at 1800. km/hr. ... the atoms part is what I'm confused about.

**physics**

I'm not sure with this conversion... getting 9.843x10^4 ft/min to m/s ? How do I get to m/s using a specification conversion without using online conversions?

**physics**

A 2000kg car is slowed down uniformly from 20m/s to 5 m/s in 4s. What is the average total force on the car during this time.

**Physics**

calculate K.E in Joules of a baseball w/ a mass of 237.2 cg moving at 85.00 mph

**physics**

how is energy conserved ith a spring and box on a ramp. does 1/2kx^2 still equal gpe? what if the spring displacement is the same but the angle of the ramp changes, causing the gpe to change. how is energy conserved since the gpe is lower than before but the spring pe is the ...

**addition vectors (physics)**

75 km at 25° north of east, then 75 km at 65° south of west, and then 75 km due south

**Physics**

17 km due north, then at 7° south of east, and then 15 km at west of south

**Physics**

When dots are placed on a page from a laser printer, they must be close enough so that you do not see the individual dots of ink. To do this, the separation of the dots must be less than Raleigh’s criterion. Take the pupil of the eye to be 2.9 mm and the distance from the ...

**Physics**

The dipole moment of a water molecule is 6.37E-30 Cm. What is the electric potential's magnitude 1.58 nm from a water molecule along the axis of the dipole?

**Physics**

2300 Joules is used to lift a wheelbarrow through 4 meters up an inclined plane into a container. Why does the man use more joules (3500 J) to push the wheelbarrow?

**Physics**

2300 Joules is used to lift a wheelbarrow through 4 meters up an inclined plane into a container. Why does the man use more joules (3500 J) to push the wheelbarrow?

**Physics**

A pilot wants to bomb his target on the ground. If the angle of the plane from the horizontal is 20° and the velocity of the plane is 80 m/s , find A). The distance that the pilot must release the bomb to his target B) the time before the bomb hits the target C) the final ...

**PHYSICS**

What is the relationship between angle and gpe with a cart and a ramp. Also if it isn't linear find away to graph it in a linear fashion.

**Laws of Physics**

A block and tackle has a velocity of 6 and it is being used to raise a mass of 68 newtons through 3 meters. The efficiency is 60% Calculate the amount of energy needed to lift the mass through 3 meters and calculate the amount of energy that was put into the system and the ...

**physics**

A 145-lb student races up stairs with a vertical height of 4.8 m in 5.5 s to get to a class on the second floor. How much power in watts does the student expend in doing work against gravity

**physics**

If a 0.50-kg block initially at rest on a frictionless, horizontal surface is acted upon by a force of 7.6 N for a distance of 8.6 m, then what would be the block's velocity

**physics**

The motion of the truck is described by the equation V = 50t – 5t^2.Find: a.Value from t = 1.5 s to t = 5.0 s. b.Vinst at t = 3.0 s.

**physics**

What is the effect of increasing the inclination of the track to the acceleration of the rider in the experiment?

**physics**

Is the motion of the rider for each angle of inclination uniformly accelerated? Why or why not?

**physics**

describe the shape of the graph made and discuss its significance.

**physics**

From the graph made, compute for the instantaneous acceleration of the rider for each inclination at any chosen time by computing for the slop of the tangent line?

**physics**

a bird can fly in still air at 20 miles per hour. when the wind is blowing straight from the north at 10 miles/hr. in what direction must the bird aim in order that it may fly from east to west and at what speed will it have?

**Physics**

How much does it cost to operate a 23-W porch light for 24 h if electric energy costs 8¢/kWh?

**Physics**

Hi, the following is a problem that concerns angular momentum: Modern hard drives spin very fast! The part that holds the data is a disk called the platter. Assume an aluminum platter that is 3.5in. in diameter, 1mm thick, and spinning at 5400 rpm. Treat the platter as a solid...

**Physics 202-help**

If we have just counted 15 seconds between the lightning and thunder, how far away do we predict the center of the thunderstorm to be using the 3 second rule and What was the percent difference between the prediction and the real distance of the thunderstorm? The speed of ...

**physics**

A proton travels to the east at 3.5*10⁶ m/s as it enters a region of uniform magnetic field. The magnitude of the magnetic field is 0.15 T and its direction is 30° north of east. Find the magnitude of the force on the proton at the moment it enters the magnetic field.

**Physics**

State the similarities between Coloumb's law And Newton's Law Of Universal Gravitation.

**Physics**

Question: A 62 kg astronaut floats outside a 3200 kg spacecraft. She's initially stationary with respect to the spacecraft. Then she pushes against the spacecraft and moves away at .50m/s to the left. I got an answer of .0096kg from doing 62*.50/3200 but that is incorrect. ...

**Physics**

Two ultrasonic sound waves combine and form a beat frequency that is in the range of human hearing for a healthy young person. The frequency of one of the ultrasonic waves is 84 kHz. (The range of hearing for a healthy young person is 20 Hz to 20 kHz.) (a) What is the smallest...

**physics**

A billiard ball travels 22 cm in the positive direction, hits the cushion and rebounds in the negative direction, and finally comes to rest 7.5 cm behind its original position.

**Physics**

A novice skier starts from rest and slides down a frictionless 35 degree incline whose height is 125 m. How fast will she be going at the bottom?

**physics**

If a resultant force of 15N acts on a body of mass 4kg for 4seconds.Calculate the change in momentum of the body

**Physics**

In really stormy weather and with the right conditions, the sky would dump a bunch of hail, making the roads rather hazardous. A choir director was driving his car in these conditions and going a tad fast under the circumstances. His car began to slip on the balls of ice in ...

**Physics**

The objective lens of a microscope has a focal length of 2cm and that of the eyepiece is 2.2cm and they are placed 8cm and 3cm apart from the objective lens.Find the distance of the; a)image I from the objective lens b)final image

**physics**

A 22.0 kg box is sliding down on an incline set at (44) degrees up from horizontal. The coefficient of kinetic friction between the box and the incline is (.27). Find the acceleration of the box. Give your answer in m/s2 and with 3 significant figures.

**Physics (Magnetism)**

In an experiment on the shuttle, an electron with a speed of 6.3 x 105 m/s [N] and a mass of 9.11 x 10-31 kg is shot through an external magnetic field. Determine the strength and orientation of the magnetic field required so that the electron's direction of travel remains ...

**Physics**

1) Imagine you were to walk 12 km 25 degrees North of East. If you could only walk south and west to get back to the point that you started from, how far would you have to walk? 2) An airplane has a velocity of 70 m/s [50 degrees W of N] with respect to the air. A person on ...

**Physics**

How meny watts need to up the 18kg in 4mtr per 15 second

**Physics**

Which of the following properties can be used to measure temperature?

**Physics**

A pickup truck is carrying a toolbox, but the rear gate of the truck is missing, so the box will slide out if it is set moving. The coefficients of kinetic and static friction between the box and the bed of the truck are 0.340 and 0.750, respectively. Starting from rest, what ...

**physics**

A uniform rectangular marble slab is 3.4m and 2.0m wide.it has a mass of 180kg.its originally lying on surface flat ground with It's 3.4m*2.0m surface facing up.How much work is needed to stand it on It's short end?(hint,think about its centre of gravity)

**Physics - Calculating work required**

Two equipotential surfaces are shown. If Va = -5V and Vb = -15V, find the work needed to move a -2μC charge from A to B along the indicated path. - First of all, does the path of the charge going from A to B matter or can I just calculate using the "distance" variable (when ...

**Physics**

If we have just counted 15 seconds between the lightning and thunder, how far away do we predict the center of the thunderstorm to be using the 3 second rule and What was the percent difference between the prediction and the real distance of the thunderstorm? The speed of ...

**physics (simple question)**

How does increasing the degree of a ramp change the an object's motion. the object is at the bottom and isn't going to go off the ramp. The object has an initial velocity.

**physics**

a sled weighing 100lb reaches the foot of a hill with a speed of 40ft/s.The coefficient of kinetic friction between the led and the horizontal surface of the ice at the foot of the hill is 0.030.

**Physics**

Please help me! 1) Karen shouts across a canyon and hears an echo 5.7 s later. How wide is the canyon? The speed of sound is 343 m/s. Answer in units of m. 2) The distance between two consecutive nodes of a standing wave is 16.8 cm. The hand generating the pulses moves up and ...

**Physics**

Physics instructor grew up with a 3 second rule for lightning bolts to allow estimation of the distance of thunderstorms. Why is that? Explain the difference between the “3 second rule” and the “5 second rule”.

**Physics-Energy**

Loop Track Location 1 Location 2 Location 3 PE (J) 0.16 0.12 0.04 KE (J) 0.03 0.06 0.09 TME (J) 0.19 0.18 0.13 h (m) 0.4 0.3 0.1 v (m/s) 1.2 1.7 2.1 Roller Track Location 1 Location 2 Location 3 PE (J) 0.12 0.08 0.04 KE (J) 0.03 0.06 0.07 TME (J) 0.15 0.14 0.11 h (m) 0.3 0.2 ...

**Physics - Electric force, field, and potential**

A 2μC charge is positioned at x = -0.8m and another 2μC charge is positioned at x = 0.8m. A positive test charge of q = 1.28*10^-18C is positioned at the origin x = 0m. Find (a) the electric force exerted on q, (b) the electric field at the origin, and (c) the electric ...

**physics**

A crate with a mass of (111.5) kg is lifted by a crane. If the crate is accelerating upward at (2.7) m/s2, what is the tension in the cable? Give your answer in newtons (N) and with 3 significant figures.

**Physics**

A cyclist and his bicycle have a combined mass of 55kg. Total area of the tyres in contact with the road is 2.2 times (10 minus power of 3) in contact with pressure exerted by the two on the ground.

**Physics - Potential Difference**

An electron moving in the + x-direction has an initial speed of 3.7*10^6 m/s at the origin. Its speed is reduced to 1.4*10^5 m/s at x = 2cm. Calculate the potential difference between the origin and that point. Which point is at the higher potential? My work and calculations...

**Physics**

A cyclist and his bicycle have a combined mass of 55kg. Total area of the tyres in contact with the road is 2.2 in contact with pressure exerted by the two on the ground.

**physics**

a typical person can tolerate an acceleration of about -49m/s2 (forward). If you are travelling at 110km/h and have a collison with a solid immovable object, over what minium distance must you stop so as to not exceed this acceleration

**physics**

a uniform plank of lenght 5m and a mass1kg support two masses of 500g and 300g . determine the centre of gravity

**Physics**

A cubes weight 15N in air and 20N when totally immersed in water. Find the value of the cube of the density. Please I need the answer.

**Physics**

A cube weight 15N in air and 20N when totally immersed in water. Find the value of the cube of the density.

**Physics**

A car of mass 1000kg starting from rest and comes down an incline slope if it travel 300m in 30 second calculate i) acceleration ii) force

**Physics**

A Simple Astronomical Telescope In Normal Adjustment Has An Objective Of Focal Length 100cm And An Eye Piece Of Focal Length 5cm What Is The Angular Magnification (a) 20 (b) 25 (c) 1/20 (d) 1/25