# Physics

**physics**

How long would it take a car that starts from rest and accelerates uniformly in a straight line at 5 m/s 2 to cover a distance of 400 m?

**Physics**

A bathroom heater uses 10.5 A of current when connected to a 120. V potential difference. How much power does this heater dissipate?

**physics**

A 50 gram ball moving to the right with a velocity of 0.6 m/s collides centrally with a 0.2 kilogram ball that is at rest. After the impact, the two balls rebound, with the heavier ball being observed to be moving to the right with a velocity of .24 m/s.

**Physics**

1 Most materials have weak magnetic properties because _____ a their paired electrons spin in opposite directions b their magnetic domains are aligned c their electrons spin d their atoms are electrically neutral 2 Which is a brittle material that is stronger than most metals ...

**physics**

I got this problem wrong and my teacher isnt helping me at all. we dont have books otherwise id look in it. in simplest terms can someone explain what the rights answer is? i got v= 227.35 m/s 4. A 124g baseball is dropped from a tree 11.6m above the ground. With what speed ...

**physics**

what equations do i use? 3. A 57kg trampoline artist jumps vertically upward from the top of a platform with a speed of 4.7m/s. How fast is he going as he lands on the trampoline 3.8m below? 4. A 124g baseball is dropped from a tree 11.6m above the ground. With what speed ...

**Physics**

A ball is allowed to freely from certain height.It covers a distance in 1st second equals ti: A)2g B)g C) g/2 C)none

**Physics**

A train starts from rest from station P and accelerates uniformly for 2 minutes reaching a speed of 60 km/hr. It maintain this speed 10 minutes and then retards uniformly for 3 minutes to comes to rest at station Q find; a) The distance in PQ in km b) The average speed of the ...

**physics**

A force F applied to an object of mass m causes it to move in a straight line a distance D during an interval of time T. The object gains kinetic energy K during this interval. In which of the following cases will the object gain the same kinetic energy K? A) A force F is ...

**Physics**

Identify the correct neutrino (Ve, Vµ, Vτ or their anti-particles) a) π+ —> p° + e+ + v b) π+ —> p° + µ+ + v c) τ+ —> e- + v + v Please explain why too...I'm really lost. I'd appreciate any help.

**Physics**

A bowling ball has a mass of 7.0 kg, a moment of inertia of 2.8 × 10−2 kg⋅m2 and a radius of 0.10 m. If it rolls down the lane without slipping at a linear speed of 4.0 m/s, what is its total kinetic energy?

**Physics**

A car is speeding along the motorway at 40 m s when the driver observes an accident ahead. He slams on the brakes, the wheels lock immediately, and the car skids to a halt. You may assume that the car travels in a straight line whilst it is skidding and that the magnitude of ...

**Physics Hons**

A solenoid 1metre long and radious 4cm has 1000 turns and is carrying 1Ampere current.find the magnetic flux density at the centre.

**Physics**

A convex spherical mirror has a radius of curvature of 10.0 cm. Calculate the location and size of the image formed of an 8.00-mm-tall object whose distance from the mirror is (a) 15.0 cm, (b) 10.0 cm, (c) 2.50 cm, and (d) 10.0 m.

**Physics**

A train starting from rest attains a velocity of 72 km/h in 5min.Assuming that the acceleration is uniform ,find (1) the acceleration and (2) the distance travelled by the train for attaining this velocity.

**Science - Physics**

If you swung a bucket of water quickly in an upside down circular path, the water would not fall out of the bucket. Which of the following best describes why this happens? a. Due to centripetal force, the water is pushing on the bottom of the bucket. **** b. Air resistance ...

**Physics**

A cricket jumps vertically upwards, and remains in the air for 1.6 s. At what speed did it leave the ground?

**physics**

What is charge

**Physics**

A 25.0-kg child on a 2.00-m-long swing is released from rest when the ropes of the swing make an angle of 30.0° with the vertical. (a) Neglecting friction, find the child’s speed at the lowest position. (b) If the actual speed of the child at the lowest position is 2.00 m/s...

**grade 11 Physics**

An open ended air column of length 35 cm resonates with a speaker sounding a 500 Hz note. If the air is vibrating in the fundamental mode, what temperature is the air?

**Physics**

If 0.022 kg of ice at 0C is added to 0.450 kg of water at 80C, what is the final temperature. (Assume that there is no heat lost to the surroundings.)

**Physics**

Copper has a Fermi energy of 7.02 eV. What is its electron number density? ---------------------- Using Ef=h^2/8m(3n/pi)^2/3 I get an answer of 2.246*10^7 but this is incorrect. I know the answer is 1.8*10^29 but am struggling to see where I went wrong. Can anyone help?

**Physics**

Identify the correct neutrino (Ve, Vµ, Vτ or their anti-particles) a) π+ —> p° + e+ + v b) π+ —> p° + µ+ + v c) τ+ —> e- + v + v Please explain why too...I'm really lost. I'd appreciate any help.

**physics**

Can anyone please help me with this? Find the force acting on a 12,500 kg F4 Phantom jet in the following situations: 1. It is catapulted from rest to 250 km/hr in 2.2 seconds. How can I find the acceleration for this problem??

**physics asap**

I have problems that i need solved as fast as possible and dont know what to do. please send answeres quick A 57kg trampoline artist jumps vertically upward from the top of a platform with a speed of 4.7m/s. How fast is he going as he lands on the trampoline 3.8m below? A 124g...

**physics**

i dont know what the answer is... i got itwrong my answer was 1.78. whats the correct answer? A 57kg trampoline artist jumps vertically upward from the top of a platform with a speed of 4.7m/s. How fast is he going as he lands on the trampoline 3.8m below?

**Physics**

The temperature of the air is 20 Celsius when a tourist drops a coin into a wishing well. She hears the splash 5.30s after she drops the coin. If the air resistance is ignored, how deep is the well? a) 344m b)332m c)137m d)120m e)0.60m

**Quantum Physics**

Calculate the transition ratio between the 2P-1S and 3P-2S states of the hydrogen.

**Physics**

A metal block of density 900kg/m3 weighs 60N in air . Find its weight when immersed in paraffin wax of density 800kg/m3

**Quantum Physics**

1. Calculate the transition ratio between the 2P-1S and 3P-2S states of the hydrogen. 2. Find the first order correction in the energy for the states n = 3 of the hydrogen atom subject to a constant electric field in the z direction (effect Stark). What are the states ...

**Physics**

A ball thrown vertically upward from the ground level hits the ground after 4 seconds calculate the maximum height it reached during its journey

**Maths, physics, science**

A spherical tank in a petro-chemical plant has a radius of 5m. If liquid is entering the tank at a rate of 1500 litres per second and the depth is 3m how long will it take to fill the tank? Give your answer in seconds.

**Physics**

A swimmer launches himself upwards from a springboard 5.0 m above the surface of the water in a swimming pool. His trajectory is (almost) vertical, and from the top of his trajectory he passes the springboard in just half of the time he takes to reach the water. How high above...

**physics**

Pls what is the specific of water? Is think is 4200 but my mates are saying it's 4180

**Quantum Physics**

1. Calculate the transition ratio between the 2P-1S and 3P-2S states of the hydrogen. 2. Find the first order correction in the energy for the states n = 3 of the hydrogen atom subject to a constant electric field in the z direction (effect Stark). What are the states ...

**Physics**

how could you tell if you had missed one of the natural frequencies when you were finding natural frequencies above the fundamental?

**Physics**

how could you tell if you had missed one of the natural frequencies when you were finding natural frequencies above the fundamental

**Physics**

how could you tell if you had missed one of the natural frequencies when you were finding natural frequencies above the fundamental?

**physics**

Determine the mass of the flywheel if it is a solid disc and the dimensions are as follows: Outer diameter = 500mm Thickness = 50mm Material density = 7500 kg/m^3

**Physics**

If enough energy were supplied to a diamond would that allow some of its electrons to transition to a higher energy band and therefore conduct electricity? Just curious.

**Physics**

A man stands on the edge of a cliff with hands outstretched horizontally carrying two stones, one in each hand. At time t= 0, he drops the first pebble from rest. After a time of 1.0 s, he releases the second pebble. At what time will the separation between the pebbles be 66 m?

**Physics**

A car starts from rest, accelerate at 2m/s , for 15sec , it then continues at a steady speed for further 25sec and decelerate to rest in 5ecs . Find the time taken to cover *two-third* of the distance.

**physics**

Six identical particles each of mass ‘m’ are arranged at the corners of a regular hexagon of side length ‘L’. If the masses of any two adjacent particles are doubled. The shift in the centre of mass is???

**Physics**

A rocket of mass,m is located at an alttitude h meters above the surface of a planet of a mass,M and radius, R. *write an expression for the gravitational pull on it. *Deduce an expression for the gravitational potential and escape velocity at that location.

**Physics**

A man stands on the edge of a cliff with hands outstretched horizontally carrying identical pebbles, one in each hand. At time t= 0, he drops the first pebble from rest.When this pebble has fallen by 2.0 m, he releases the second pebble. What is the vertical distance between ...

**Physics**

A rocket travels vertically away from the surface of Mars. It is still close to the surface and travelling at a speed of 25 m s when it jettisons an empty fuel tank. The fuel tank initially travels with the velocity of the rocket, but it is attracted to Mars and reaches the ...

**physics**

The mass of a rocket car plus fuel is 2,000 kg. The rocket car starts from rest. The engine expels fuel (in the form of exhaust) over a period of 8 seconds. The exhaust has a velocity of 1,000 m/s due west, and the velocity of the rocket after 8 seconds is 90 m/s due east. How...

**physics**

15.1 1 Section L I A 50 mL beaker is filled to the brim with mercury. How much does the mercury in the beaker weigh?

**Physics**

In a steady flow system crude oil of density 1200 kgm-3 flows at the rate of 275kg/min through a horizontal pipeline of varying cross-sectionional areas 0.068 and 0.083m2 respectively. Determine the absolute pressure between X and Y.

**Physics**

if water rises in a capillary tube 5.8cm above the free surface of the outer liquid. what will happen to the mercury level in the same tube when it is placed in a dish of mercury?(diagram is also necessary)

**physics**

Pls is specific capacity of tin 226 j.kg/k

**physics**

A concrete slab of mass 400 kg accelerates down a concrete slope inclined at 35°. The u kinetic bn the slab and slope is 0.60. Determine the acceleration of the block.

**physics**

Two blocks with masses 5 kg and 2 kg are connected (via frictionless, massless pulleys) by a light, inextensible string, as shown. There is no friction between the 5 kg block and the horizontal surface on which it moves. The tension T in the string supporting the 2 kg block is...

**Physics**

a metal ball of radius R is placed concentrically inside a hollow metal sphere of inner radius 2R & outer radius 3R. The ballis given a charge +2Q and the hollow sphere a total charge -Q. Calculate. electrostatic potential energy of system.???

**physics**

Describe an experiment to determine the saturation vapour pressure of water in the temperature range 25 degree Celsius to 70 degree Celsius. Sketch the curve you would expect to obtain

**physics**

Explain why ice is formed on the aluminium lumps and not on the walls of the beaker

**physics**

How would you determine the value of the specific latent heat of steam in the laboratory? What precautions are necessary to obtain an accurate results

**physics**

Explain the statement: the saturation vapour pressure of water at 60 degree Celsius is 149.4 mm of Mercury. Thanks

**physics**

What is meant by the statement that the specific latent heat of steam is 2260000jkg

**physics**

Explain why food can be cooked more rapidly by boiling it in salt water than by boiling it in pure water

**physics 11**

An arrow is shot horizontally towards a target 20 m away. In traveling the first 5 m horizontally, the arrow falls 0.2 m. In traveling the next 5 m horizontally, what will the arrow additionally fall?

**Physics**

For what combination of parallel and series resistors will resistors of 25 ohms, 100 ohms, 50 ohms, and 50 ohms have a total resistance of 62.5 ohms?

**physics**

What are the differences between evaporation and boiling

**physics**

Pls help me. Explain the following a. When methylated spirit is poured on the skin, it has cooling effect, b. A piece of ice at 0 degree Celsius cools a drink more effectively than the same mass of cold water at 0 degree Celsius, c Ice floats on water, d. Moisture is deposited...

**physics**

Describe an experiment to determine the boiling point of a small quantity of a liquid

**physics**

Pls if you help I will be grateful. How would you determine the specific heat capacity of a solid? What precautions would you take to obtain an accurate results

**physics**

A piece of copper of mass 300 g at a temperature of 950 degree Celsius is quickly transferred to a vessel of negligible thermal containing 250 g of water at 25 degree Celsius. If the final temperature of the mixture is 100 degree Celsius calculate the mass of the water that ...

**physics**

Pls help me God will bless you all. A piece of copper ball of mass 20 g at 200 degree Celsius is placed in a 50 g of water at 30 degree Celsius, ignoring heat losses, calculate the final steady temperature of the mixture. Specific heat capacity of water=4.2j/ kg.g

**physics**

Pls help pls help me solve. Dry steam at 100 degree Celsius is bubbled into 500 g of water originally at 20 degree Celsius. What will be the temperature of the water after 30 g of steam has condensed? ( specific heat capacity of water =4200,specific latent heat of steam =2260000

**physics**

How can I change each of Normal force, Gravity and Friction force?

**physics**

Calculate the specific heat capacity of the materials for which the heat supply,mass, and temperature rise are given below (a) 25200j, 0.3kg, 20k, (b) 8000j, 500g, from 20 degree Celsius to 60 degree Celsius (c)9450 j, 150g,from15 degree Celsius to 45 degree Celsius

**physics**

150g of ice at 0 degree Celsius is mixed with 300 g of water at 50 degree Celsius. Calculate the temperature of the mixture

**physics**

What mass of ice at -14 degree Celsius will be needed to cool 200 cm of an orange drink from 25 degree Celsius to 10 degree? (specific latent heat of fusion of ice=336000,specific heat capacity of ice=2100 specific heat capacity of water=4200

**Physics**

I have to fill the following table, I know it should only be applying formulas, but I'm not sure which formulas should I apply in every section. I would like to know which is the difference between the conductivity in Siemens per meter and the conductivity depending on w and E...

**Physics**

Anybody help me with this? A disk with mass m = 6.5 kg and radius R = 0.41 m hangs from a rope attached to the ceiling. The disk spins on its axis at a distance r = 1.4 m from the rope and at a frequency f = 19.4 rev/s (with a direction shown by the arrow). 1) What is the ...

**physics**

Can anyone please help me with answering this? : A person of mass 75 kg stands on a scale inside an elevator. What can you infer about the motion of the elevator if the scale reads 735N and 900N?

**physics**

Can anyone please help me with this? : An electron of mass 9.11 x 10^-31 kg is accelerated by a constant force along the direction of its motion from 2 x 106 m/s to 8 x 106 m/s within 2.00 cm. What is the magnitude of the force?

**Physics**

Explain fully one pro and one con of nuclear energ

**Physics**

A photon a. is a quantum of light b. is a wave c. means bundle of energy(I think it's this one)

**physics**

Find the force acting on a 12,500 kg F4 Phantom jet in the following situations (you will need to find the acceleration first) : 1. It is catapulted from rest to 250 km/hr in 2.2 seconds. Acceleration: (250/2.2) / 2.2 = 51.6 F = 12,500 * 51.6 = 645 645N Is my answer correct? I...

**Physics**

The atomic number of an element is determined by the number of electrons in the nucleus of the atom. True False*** The motion of electrons can be predicted precisely. True False*** Leptons are found in the nucleus of atoms. True False*** Matter can change its form but it ...

**Physics - please help!**

Hello, I'm totally lost on how to solve this physics problem. Where/how do I insert the variables?? "Light travels from one material with a refractive index (n1=1.5) to another material with refractive index (n2=1.7). If it strikes the surface at a 45° angle (it would also be...

**Physics**

The moon rotates about its axis every 27.3 days and orbits the earth every 27.3 days. A) what is the moment of inertia with respect to its axis? B) What is the moment of inertia with respect to the earth? C) What is the moons angular momentum with respect to its axis? D) WHat ...

**physics**

If you have a mass of 60 kg and are shot out of a cannon at 30 m/s A) what height will you reach according to the conservation of energy? B) what is your total energy?

**physics**

A force of 30 Newtons is used to elongate a spring a distance of 9 cm. A) What was the coefficient of elasticity of the spring? B) How much work must be done to elongate the spring a distance of 18 cm.?

**Physics**

The electron-volt is _____ than the SI unit for the same physical quantity. a. smaller b. greater

**Physics**

Why are alpha and beta rays deflected in opposite directions in a magnetic field? Why are gamma rays not deflected at all? Why are alpha particles with the same velocity deflected less than beta particles?

**Physics**

A great physicist by the name of Richard Feynman said, "I think it is safe to say that no one understands quantum mechanics." What do you think he meant by this? Does this mean quantum mechanics is wrong? How can we know?

**Physics**

Suntan Sally put on her bathing suit and relaxed in a room that was pitch black. At the same time Tanline Timmy put on his bathing suit and relaxed in a room filled with bright light. A couple hours later Suntan Sally had a bad sunburn while Tanline Timmy wasn't? How is this ...

**physics**

An ideal gas occupies a volume of 1.87 cm3 at 15.7°C and a pressure of 101,325 Pa. a) Determine the number of molecules of gas in the container. Boltzmann’s constant is 1.38 x 10-23 m2kg/s2K Answer: b) Determine the total internal energy of the gas.

**physics**

find the magnitude and dirction of the resultant force of two perpendicular forces F1=3N and F2=4N

**Physics**

Note: the question with stars next to it is my choice. (Image) Car A. - mass: 10 kg, 8 m/s Car B - mass: 10kg 2 m/s 1. The total momentum of the two cars before a collision is 100 kg m/s A - 0 kg m/s B - 50 kg m/s C - 100 kg m/s D - 200 kg m/s**** 2. What is the momentum of a ...

**Physics**

So a quick question. If im representing a quantum gas with diagrams of the allowed configurations of the gas. When it comes to indistinguishable I have 7 configurations. But if we then compare to a gas made up of distinguishable particles. Would there be more or less ...

**physics**

A truck moving at 100 km /h carries a steel girder that rest on its wooden floor. what is the minimum time in which the truck can come to a stop without the girder moving forward ? The coefficient of static friction between steel and wood is 0.5.

**physics**

Two buckets each of mass 5kg are connected one each end of a light inextensible string going over a smooth pulley. A piece of putty of mass 2kg is dropped through a height of 20m into one bucket and become attached. Calculate (i) The initial velocity of the system after impact...

**physics**

In the circuit at right, two resistors are connected in parallel. What is the voltage across the 4 Ω resistor? What is the voltage across the 12 Ω resistor?

**physics**

A circuit is powered by a 5 V battery and has 0.2 A of current through it. If the circuit contains two resistors connected in series and one of the resistors has a resistance of 5 Ω, what is the resistance of the other resistor?

**physics**

can anyone please help me with answering this question? : An accelerating body has a Net Force acting in the direction of motion. True or False? Why?

**physics**

How is light emitted from incandescent lamps? Fluorescent lamps? Candles?

**physics**

How much current flows through two resistors with resistances of 10 Ω and 20 Ω that are connected in series and to a 10 V power supply?