# Math/Physics

208,687 results, page 53

### Physics

If you wish to warm 100 kg of water by 20° C for your bath, show that 8370 kJ of heat is required.?

### Physics

torque to move a block of m=200kg for 10m at an angle of 25 degree with a speed of 20m/s.

### physics

two vectors A and B each have magnitude 220 and angle BETWEEN THEM IS 120 WHAT WILL BE RESULTANT?

### Physics

I don't understand this question... What is the change in entropy for a system that has 250 J of heat added to it at 25°C? (Points : 1) 10 J/K 0.84 J/K 0.84 J/K 10 J/K

### physics

What are the principles behind seatbelts and air bags that make passengers safer in a collision?

### physics

explain the input energy and out put energies of two kitchen machines

### Physics

explain the input energy and out put energies of two kitchen machines

### physics

explain the input energy and out put energies of two kitchen machines

### physics

The mass of an iron cube having an edge length 1.8 cm is 70 g. Find itd density.

### Physics

If an object has a work of 300J and a displacement of 20m, how would I determine the net force?

### physics

a bus decreases its speed from 80kmh-1to 60kmh-1 in 5 sec find the acceleration

### PHYSICS

A point source of a wave emits 195 watts. What is the intensity at a distance of 4.56 meters? I =

### physics

Things around you are emitting infrared radiation that includes the wavelength 1.44 10-5 m. What is the energy of the photons?

### Physics

What is the partial pressure of water on a day when the temperature is 25C and the relative humidity is 33% P=___Pa

### Physics

A golf ball struck with an initial speed of 41.8m/s. What is the range of the shot if the launch angle is 30.0º?

### Physics

A vibrating point on a spring travels 60 mm during three cycles. What is the amplitude of the vibration?

### Physics

8.2 kg of ice is taken from a temperature of -49 C into steam at 123 C. What is the energy used? Q_total =

### physics

What is the free-fall acceleration in a location where the period of a 2.87 m long pendulum is 3.4 s? Answer in units of m/s 2

### physics

The elastic potential energy of an object may be negative Select one: True False

### physics

if a train at 72kmphr is to be brought to rest in a distance of 200 m then its retardation is A 20m/s^2 b 10m/s^2 c 2m/s^2 d 1m/s^2

### physics

Find the work done by 2.32 moles of an ideal gas if its volume doubles at a constant temperature of 22.6°C.

### Physics

A 2.73 kg particle has a velocity of vx = 6.02 m/s and vy = 0.316 m/s. Find the magnitude of its total momentum. Answer in units of kg · m/s

### physics

How much force is needed to accelerate a 50kg rider and his 250kg motorcycle at 4m/s27

### Physics

if the mass of two balls is 0.300 kg each then what is the gravitational force between them if the distance is 0.3000 m

### physics

An aircraft on its take-off run has a steady acceleration of 3.0 m/s2. It's velocity after 10 seconds will be

### physics

what must be the mass of the log to be lifted up by the hand, if the muscle cross sectional area is 17 cm^2?

### physics

If you heat a thin circular ring in a oven, does the rings hole get larger or smaller.why?

### physics

If a nuclide has a decay constant of 10^-6 s-1 what is its half life ??? I think it is 0.693 / 10^-6 = 693000 or 6.93 x 10^5 Is this right ...

### physics

Write down the unit in which reaction rate is measured in this observation? Equation is Zn(s)+I~ZnI

### Physics

What is the magnitude of the electric force between a proton and an electron when they are at a distance of 2.63 Angstrom from each other?

### physics

if the resultant of 2 equal force inclint to each other at 60° is 8root3N. Find the component forces?

### physics engg.

A deutron is moving with a speed of 2*10^8m/s. Find the wavelength of the matter wave associated with it?

### Physics

What electric field strength would store 17.5J of energy in every 9.00mm3 of space?

### Physics

Calculate the average speed (in km/h)of Larry, who runs to the store 3.6 kilometers away in 40 minutes.

### Physics

What is the peak current through a 400–W room heater that operates on 120–V AC power?

### Physics

How long does it take a vehicle with 40hp to achieve 25m/s(meters per second)?

### Physics

An object that starts from rest completes 7 revs in 3 seconds. What is angular accel. in rad/s2?

### Physics

If I dropped a bowling ball from the empyre state building, at what velocity would it descend?

### physics

A car travels in a straight line for 2.8 h at a constant speed of 53 km/h . What is its acceleration? Answer in units of m/s 2

### Physics

What is the minimum energy needed to change the speed of a 1600 kg sport utility vehicle from 15.0 m/s to 40.0 m/s?

### Physics

A 0.50 kg hammer is taken on a space mission. What is its weight on a planet where the acceleration due to gravity is 3.8 m/s2? 0.50 kg 1.9 kg 0.50 N 1.9 N

### physics

A car travels in a straight line for 3.9 h at a constant speed of 63 km/h. What is its acceleration? Answer in units of m/s2

### Physics

700 kg plane is traveling at 90 m/s at altitude of 1500 m what is planes total mechanical energy

### physics

A dart is thrown horizontally toward X at 30 m/s as shown. It hits Y 0.29 s later. The distance XY in centimeters is:

### physics

A bus moves from rest with a uniform acceleration of 2ms(square)for the first 10s.

### physics

How can the equation be prove:maximum height,time of flight and maximun range in projectile?

### physics

What force F must be applied to the small piston to maintain the load of 49 kN at a constant elevation?

### physics

How high must your roof be to fire 1.2km if it fires at 450 m/s muzzle velocity?

### physics

a boy pulls a bucket of water of mass sky from a well of depth 10 cm calculate the work done ?

### physics

Calculate the velocity of a skateboarder who accelerates from rest for 6.7 seconds down a ramp at an acceleration of 6.5 m/s2

### physics

what should the ratio of mass to volume be when considering the flight of a hot air balloon.

### physics

A 4.53 kg particle has a velocity of vx = 3.98 m/s and vy = −3.16 m/s. Find the magnitude of its total momentum. Answer in units of kg · m/s

### Chemistry Physics

What is the wavelength of an electromagnetic wave with frequency 50.0 MHz? Am I starting this problem like this? 3.00*10^8/50*10^6 =6*10^12

### Physics

A guitar string has a mass of 30g and length of 2m. Find the tension if its density is 0.2kg/m^3

### Physics

I don't understand how to do this : A force of 40 N accelerates a 7.17 kg block at 6.0 m/s2 along a horizontal surface. Determine the normal.

### Physics

A 4.26 kg block starts up a 33.0 degree incline at 7.81 m/s. How far will it slide if the coefficient of kinetic friction is 0.23?

### physics

a 50 gram object is accelerating at a rate of 5 m/s2. calculate the force needed to produce this acceleration

### physics

A guitar string 61.8 cm long vibrates with a standing wave that has three antinodes. Which harmonic is this?

### Physics

. How much potential energy does the 2.5 kg rock sitting on an 18 –meter high cliff have?

### physics

how much heat is needed to raise the temperature of 5kg of silver from 20 degrees C to 96 decgrees C?

### physics

hummingbirds beat their wings 1500 times in 30seconds calculate frequency and the period

### Physics

A 3kw engine operates for 3secs, 10kgf force is applied find the Displacement.

### Physics

how much work is needed to stop a 20kg bullet moving with a speed of 150m/s?

### Physics

How much is needed to melt an ice cube, 3 centimeters on each side at 0 degree celcius?

### Physics

Find the magnitude of the sum of two forces, one 24 N and the other 9 N, when the angle between them is 60.0o.

### physics

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)

### Physics

Assume the distance axis is linear and da = 10.0m and db = 35.0 m. Estimate the work done by a force F in moving a 2.80 kg object from da to db.

### Physics

When you jump vertically 0.86 meters above the ground, what is your acceleration when you reach your highest point?

### PHYSICS

A hypothetical planet has a mass 1.55 times that of Earth, but the same radius. What is g near its surface?

### Physics

What is the capacitance of a capacitor that stores 5.2 μC of charge on its plates when a voltage of 4.8 V is applied between them?

### physics

If a man weighs 820N on d earth what would be on Jupiter, where the acceleration due to gravity is 25.9m/s

### physics

A radio station is broadcasting at 90.7 mhz. compute for its wavelength in angstrom and energy in kilojoules.

### Physics

A football player kicks with a speed of 21 m/s at 37 degree to the horizontal. How long is the ball in the air?

### Physics

Billy stands on a hill without slipping. In which direction is the force of friction acting?

### Physics

1. Given t1/2 to be 0.0137 seconds, how long should it take to reach 87.5% of maximum charge?

### physics

how can we derive the work-energy theorem form Newton's second law of motion?

### physics

What is the magnitude and direction of an electric field that exerts a 4.00 ✕ 10 -5 N upward force on a - 1.80 µC charge? N/C

### Physics

If the force of repulsion between two socks is .003 and they are 2 cm apart what is the charge on each sock

### mathematical physics

Solve the following ODE using the power series method (1-x^2)y"-2xy'+2y = 0

### mathematical physics

Obtain all the first and second order partial derivatives of the function: f( x, y ) = In(I+xy^2)

### mathematical physics

Solve the following ODE using the power series method (1-x^2)y"-2xy'+2y=0

### Physics

a 475 kg pre-stressed concrete beam is to be raised 10.0 m in 24.0 s. how many kw of power is needed to for the job

### physics

two point charge q1=50c , q2=10c are lactated at (-1,1,-3)m, and (3,1,0)m, respectivly. Find the force on q1.?

### physics

a boy drops a mango from a tree it falls without rebound what happens to it's momentum

### Physics

Two pellets, each with a charge of 1 microcoulomb, are located 3 cm apart. What is the electric force between them?

### Physics

What is the velocity of an object that is dropped from a height of 20m,just before it reaches the ground?

### Physics

In an AC circuit with a frequency 25 Hz producing an rms voltage of 30 V and a 20 farad capacitor, what is the end current?

### physics

a ball of mass m is thrown vertically upwards with Vo= 10j m/s. Study nature of motion

### physics

14,0 of KOH is neutralised in 1dm^3 of water by sulphuric acid with a concentration at 0,1 mol dm^-3 how do i calculate it

### physics

Calculate the work done if a force of 300N Is applied at 30° to the horinzontal and body moves 20m

### Physics

What is the tension in the string in (Figure 1) ? The volume of plastic ball is 95 cm3 and the density is 840 kg/m3.

### physics

how many energy is transferred when 8.9g of liquid hydrogen changes to gas -253 degree celsius

### Physics 2

If water at 0 oC is heated, it actually decreases in volume until it reaches Select one: a. 1 oC. b. 2 oC. c. 3 oC. d. 4 oC. e. 5 oC.

### PHYSICS

A hypothetical planet has a mass 1.49 times that of Earth, but the same radius. What is g near its surface?

### Physics-PLEASE HELP

A man walks for 5 km/hr for 1 km and 7 km/hr for next 1 km. What is his average speed for the walk of 2 km? -5.8 km/hr -6.0 km/hr -2.0 km/hr -1.0 km/hr Thank you very much!!

### Physics

A car travels in a straight line for 2.9 h at a constant speed of 77 km/h . What is its acceleration? Answer in units of m/s^2

### physics(measurement)

What accurate method can be used to determine the thickness of a coin. Explain pls..

### Physics-VECTORS

Find the vector's magnitude and direction. Part A A⃗ = 4 i^− 8 j^ A =? θA =?

### Physics

A student walks from her apartment a distance d=139m to the bus stop at a speed of v1= 1.40m/s.