# Physics!

73,661 results, page 85

### Physics

An outfielder throws a 2.12 kg baseball at a speed of 114 m/s and an initial angle of 54.8 ◦ . What is the kinetic energy of the ball at the highest point of its motion?

### physics

an electric heater with a resistance of 40 requires 220v across its terminals. a,what is the power dissipated in the resistor b,how much heat is transferred in 1hour

### physics

use a scale diagram to determine: 1.the image distance 2.magnification for an object placed 1cm in front of a convex lens of 10cm

### Physics

Is Gc (32.2 lbmft/lbfs^2) equal to gravity? I think it is, but I'm kinda confused about the whole concept. Could someone explain it to me? Thank you very much.

### Physics helllppp

8] Find the minimum stopping distance for a car moving at 108km/h if the coefficient of static friction between the tires and road is a) 0.9

### Physics

Find The Potential Energy Of A Boy Mass 10kg Standing On A Building Floor Of 10 Metres Above Ground Level. 10*10*10 =1000

### physics

With what frequency would you have to push a child on a swing that had supporting chains that were 2.3 m long? Express your answer in Hz to 3 significant digits.

### Physics

A bullet of mass 200 grams is forced with work speed of 400 m/s of it is stopped in 100 m, Find: a.) KE b.) Force needed to stop it

### Physics

Abby went skiing and was sliding down a 10 degrees hill. Ignore friction and air resistance. What is the x-component of the weight? The mass is 76-kh

### Physics

A ball is projected so as to reach a height h passes points p and q with velocites v/2 and v/3 where v is the initial velocity with which the body is thrown the distance between p and q in terms of h is

### Physics

A car requires velocity of 36 km/h in 10sec just after the start . It takes 20sec to stop . Calculate the acceleration in both the cases .

### Physics help

How fast would you need to be travelling relative to an observer in order for them to see a 15% increase in your mass? How do I rearrange the formula to solve for v m = n/sqrt(1-(v^2)/c^2))

### physics

A train is moving with an initial velocity of 30 m/s the breaks are applied so as to produce uniform acceleration of minus 1.5m/s Calculate the time in which it will come to rest

### physics

the resistance of a platinum resistant thermometer is 1.2ohms. when the measuring in Kelvin temperature of oil and 1.0ohms at the triple point of water. find T

### physics

What's kinetic energy in electron volt of a triply ion iron which has been accelerated from rest through a potential difference of 100v?

### Physics

An electron with a kinetic energy of 0.8 keV is fired normal to the lines of a field of magnitude 50 G. Find: a)the radius of the path b)its acceleration c)its period

### physics

a car whose brakes are locked skids to a stop in 100m from an initial velocity of 20m/s. find the coefficient of sliding friction

### Physics

A particle covers an angle of 120¡ã while moving along the circumference of a circle. Find distance and displacement.

### physics

A bus is moving at a speed of 20m/s beyond to slow at a constant rate of 3m/s each second find how far it goes before stopping

### Physics

A bomb explores in mid air into two equal fragments.what is the angle between their direction of motion? Ans:- 180°

### Physics

You are testing a car on the Nevada salt flats traveling 85 m/s. Your parachute deploys and you decelerate at 13 m/s^2. How long does it take to come to a complete stop?

### Physics

I think it is D) but I'm not quite sure. Thanks in advance! Right after the ball is thrown at angle of 45 deg, the acceleration is a)g b)sin(45) * g c)cos(45) * g d)tan(45) * g

### physics

An airplane accelerates down a runway at 3.33 m/s2 for 35.3 s until is finally lifts off the ground. Determine the distance traveled before takeoff.

### physics

a 1240 kg automobile stops in a distance of 41m. if initial velocity was 22.5m/s, what force did the road exert on the car to stop it? Answer pls... Thank You

### physics

a 1240 kg automobile stops in a distance of 41m. if initial velocity was 22.5m/s, what force did the road exert on the car to stop it? Answer pls... Thank You

### physics

Scalar product of three vectors? Given:A=(axi+ajy+azk) B=(bxi+bjy+bzk) C=(cxi+cjy+czk)

### PHYSICS

What is the magnitude of the instantaneous velocity (speed) of a freely falling object 13 s after it is released from a position of rest? Consider the acceleration of gravity to be 10 m/s2 .

### Physics

compute for the power while pushing an object by a 200N force making 18 degrees above the horizontal covering a distance of 7.5m in 0.5 minute?

### Physics

A baseball with a mass of 0.145 kg is thrown straight down at the ground. At a particular speed, it has a drag force of 0.4 N acting on it. What is its acceleration at that time? a. -7.0 m/s2 b. -2.8 m/s2 c. -9.8 m/s2 d. -12.6 m/s2

### Physics, Class XI

If a force of 15 kg. weight acts on a mass of 14 kg, what will be its velocity after 8 seconds? What is the process to apply the formulas in this question? Please help me fast!

### Physics

A brick of mass 2kg just begins to slide down an inclined plane at an angle of 45 degree with horizontal.what will be the force of friction

### physics

calculate the volume in cubic centimeters and area in square millimeters of a spherical bacterium of diameter 2.0um. model the bacteria is spheres

### physics

A certain vehicle can accelerate from rest to a speed of 25m/s in a time of 8s.What average power is needed to cause this acceleration?Neglect frictional losses

### Physics

Two blocks of masses 2.9kg and 3.9 kg are held by string upper and lower and given the acceleration 0.2 in upward direction gind tension

### Physics, Science

How would the length of a day be affected if all the world’s inhabitants continuously walked in an easterly direction? When they stopped walking?

### Physics

An object is placed at a distance of 50cm from a convex lens of fical length 20cm .find the nature and position of yhe subject.

### physics

Two identical balls A and B are released from the positions .They collide elastically on horizontal position MN. The ratio of the heights attained by A and B after collision will be ?

### physics

The displacement of a block attached to a horizontal spring is given by x=0.5sin(7.8t−1.06)m What is the earliest time (t>0) at which x=0.16m? Find the acceleration when x=0.44m helppppppp

### physics

a point mass of 12.5 kg is hung from an 18.3 m long rope and swings back and forth with an amplitude of 2.34m. what is the oscillation period for the pendulum system?

### modern physics

Calculate the deBroglie wavelength of a^ 87Rb atom that has been laser cooled to 120 µK. (Assume that the kinetic energy is .3/2kBT)

### physics

A wheels is turned at prequency at 2.0 revelation per second and then is allow to come to rest. If it those so in 30sec ? How far did it turn in aprocess

### physics

a d'arsonval meter movement deflects to 0.8mA. what is the peak value of the alternating current if the instrument uses full-wave rectification?

### Physics

A radiation with frequency 8.5×10^14Hz is incident on a metal emitting photo electrons. Taking Planck's constant, determine the threshold wavelength.

### physics

a cylindrical storage tank has a radius of 1.05m. when filled to a height of 3.79m, it holds 13500kg of a liquid industrial solvent. what is the density?

### physics

Two point charges of magnitude +3.0 nC and +2.0 nC respectively are placed 2.0cm apart. Calculate the resultant electric field strength at their midpont E= E1 + E2

### physics

a cylindrical vessel of length 1 m and area 1mmsq is filled with water and rotated with an angular speed of w= 20pi find the rise in temp

### Physics

Your electric jug element produces 1.5kW of power. What is the minimum time it will take to heat 1.5L of water from 20 degrees Celcius to boiling

### AEJC , physics

a flywheel of mass 200 kg is rotating at the rate of 8 rps . find the constant torque required to stop the disc in 11 rotations.

### Physics

A man walks 50 m,East, 30 m, South, 20 m,West and 10 m, North. Determine the displacement from the starting point. Find the distance traveled in FPS

### Physics

A bullet fired target loses half of it velocity in penetrating 15cm .how much further it will penetrate before coming to rest

### Physics

The Sound of Tissue is 1550m/s. What frequency ultrasound wave should you use to make sure you probe 65mm into the body?

### Physics

A metal disc of radius R rotates with angular velocity Omega (w) In a uniform magnetic field. Calculate the induced emf develop.

### Physics

Calculate the length of a displaced pendulum Bob which pass through its lowest point twice every second. Take g=10m/s²

### Physics

How fast (in rpm) must a centrifuge rotate if a particle 69-cm from the axis of rotation is to experience an acceleration of 200438 g's? (can you show me how you get the answer) be thorough

### Physics

George drops a stone from atop a cliff of 25m. How long does it take to hit the ocean below, what velocity is it travelling when it gets there?

### physics

Consider a particle initially moving with a velocity of 5m/s starts deaccelarating at a constant rate of 2m/s*2 find the distance travelled in 2sec? Ans:2m

### physics

an object 5cm lenght is placed at distance of 20cm in front of a convex mirror of radius of curvature 30 cm . find the position of the image

### Physics

A weightlifter raises a 200 kg barbell over his head from the floor a displacement of 2m in 2.2 seconds. What is the average power he develops during the lift?

### Physics

A train, with an initial velocity of 35ms^-1 along a straight track, deccelerates at a constant 0.25ms^2. Determine how far it travels in 2 minutes.

### physics

calculate the impulse imparted to the object in the following collision: a 0.5 kg hockey puck moving a5 35 m/s hits a straw bale, stopping in 1 second.

### physics

Determine the x and y components of the following three vectors in the xy plane. 1) A 19-m/s velocity vector that makes an angle of 40° counterclockwise from the -x direction. x: 2) y: Explain please!

### General Physics 2

three charges, +2.5×10^-6, -4.8×10^-6, and -6.3×10^-6, are located at (-20m,0.15m), (0.50m,-0.35m), and (-0.42m,-0.32m) respectively. What is the electric field at the origin?

### Physics

Two forces, F1 and F2, act on the 5.00 kg block shown in the drawing. The magnitudes of the forces are F1 = 69.0 N and F2 = 24.5 N. What is the horizontal acceleration (magnitude and direction) of the block? F1 is pointing at the top left corner of the box forming a 65 degree ...

### Physics

1) A physics book is moved once around the perimeter of a table of dimensions 1 m by 3 m. What is the distance traveled? 2) A window washer drops a brush from a scaf- fold on a tall office building. What is the speed of the falling brush after 2.7 s? (Neglect drag forces.) The...

### PHYSICS

a 60 km/h wind is blowing in a direction 30 degrees north of east. a. what is the component of the velocity oriented to the east? b. what is the component of the velocity oriented to the north? The component east is 60cos30. For both a and b, draw a diagram with a horizontal ...

### Physics

A planet has two satellite moons. Moon X has an orbital period of 2.13 days. Moon Y has an orbital period of about 3.53 days. Both moons have nearly circular orbits. Use Kepler's third law to find the distance of each satellite from the planet's center. The planet's mass is 2....

### Physics to Elena

Estimate the total binding energy for copper. 550 MeV Estimate the energy, in joules, needed to break a 3.0g copper penny into its constituent nucleons. E= in Joules Please help me out I got 1st part I need the Energy in joules am confused please help me out...thanks Physics...

### Physics sorry for reposting but I really need help

An example of the neutron absorption reaction is . 1 0 n+10 5 B-->7 3 Li+ 4 2 He The rest masses of each particle in atomic mass units (u) are 1 0 n= 1 u 10 5 B=10 u 7 3 Li =7 u 4 2 He= 4 u where 1u=1.66x10^-27 kg. calculate Q Q= in MeV I have the same question please ...

### Physics

What is the resultant of two displacement vectors having the same direction? a. The resultant is the sum of the two displacements having the same direction as the original vectors. b. The resultant is the difference of the two displacements having the same direction as the ...

### physics

The physics of satellite motion around Jupiter. A satellite of mass 2.00 x 104 kg is placed in orbit 6.00 x 105 m above the surface of Jupiter. Please refer to the data table for planetary motion included in this lesson. a) Determine the force of gravitational attraction ...

### physics

Biophysics strikes back The Biophysics students are having their usual Saturday night biophysics party performing physics experiments at a classmate’s home. This Saturday it is in an apartment building and you notice a managemnt student (MS) passed out in the stairwell. The ...

### physics - drwls?

The flywheel of a steam engine runs with a constant angular speed of 250 rev/min. When steam is shut off, the friction of the bearings stops the wheel in 2.1 h. At the instant the flywheel is turning at 75 rev/min, what is the tangential component of the linear acceleration of...

### Physics .. hard problem

An overly eager physics student wants to confirm that the acceleration of gravity is ag=9.8 m/s^2. To check this, the student steps off the roof of the Sears Tower (height at the sky deck 427m). The rocketeer (who arrived five seconds after the student stepped off) uses a ...

### physics

i need help with this one! A 100KHz oscillator that's followed by a doubler and two triplers will produce an output of frequency.... a.) 180 kHz b.) 500 " c.) 800 " d.) 1.8 "

### physics

what are the merits and drawbacks of using a person's foot as a standard? keep in mind that it is advantagous that fundamental standards be accessible, invariable, indestructible, and reproducible.

### physics word problem

A 1000-kg car moving at 10 m/s brakes to a stop in 5 s. The average braking force is? On this question I asked my teacher I am suppose to get 2000 N and I don't get how to get it.

### physics help

A 1000-kg car moving at 10 m/s brakes to a stop in 5 s. The average braking force is? when i work this out with the formula that you gave me, i get 2525 instead of 2000 N

### Physics

In terms of Ohms Law (V=IR), when plotting a graph of V against I, is it safe to say that the line passes through the origin, even though 0/0 does not exist?

I don't understand these questions. Give two examples of common force fields? How is the magnitude of an electric field defined? -I got that it is its strength

in what position can a current-carrying loop of wire be located in a magnetic field so that it doesn't tend to rotate? -I think it would be perpendicular

### Physics

What is the length of a simple pendulum that marks seconds by completing a full swing from left to right and then back again every 2.0s? explain plz

### Physics

I was just wondering, since cathode ray tubes arent being made, are the only types of TVs available the plasma and the LCD?

### Physics

A wagon was used to move a 90 lb rock 120 yds. It took 40 sec and 70 lbs of force. Can someone help me solve for efficiency and horsepower????? PLEASE :)

### physics

A 1,5000kg car starting from rest is accelerated by a force of 2,oooN during the first 15seconds of its motion. Find the speed at the end of that's time

### physics

How much work must be done to roll a metal safe, mass 116 kg, a distance of 15.0 m across a level floor? The coeffecient of friction is 0.050.

### Physics

Why does the blood of deep sea divers look greenish-black in underwater photographs taken with natural light, but red when flashbulbs are used?

### Physics

When a solar flare erupts on the surface of the sun, how many minutes after it occurs does its light show up in an astronomer's telescope on earth? I am totally confused..help!

### physics

1.2g projectil e shot horiz. at a speed of 105m/s off a 124m high cliff. a) determine time taken by the projectile to return to the ground..

### physics

A stone is thrown downward into a well with an initial speed of 5.00 m/s. The sound of splash is heard 1.50 s later. Find the depth of the well if the air temperature is 15.0 ˚C?

### physics

A stone is rotated steadily in a horizantal circle with a period T by a string of length L. If the tension in the stringis constant and L increases by 1% find the percentage change in T.

### Physics

A rocket blasts off with acceleration of 5 m/s squared. After 1 min it runs out of fuel. What is the max height and total time in the air?

### Physics

display.cgi?id=1225682948 I'm still confused about how you got the (1/8)kx^2 and how to find the weight's maximum height at the top of its path through the air.

### Physics

Can someone help me with finding out the magnitude of the gravitational force a person with a mass of 67.5 kg would experience while standing on the surface of Earth? Thanx in advance.

### Urgent Physics!

A top starting from rest is spun for 3 seconds achieving an angular speed of 20 rad/s. How many radians has it gone through in this time? (a is constant)

### physics

During a workout, a person repeatedly lifts a 13 lb barbell through a distance of 1.5 ft. How many "reps" of this lift are required to burn off 100 Cal?

### physics

Two freight cars, each with a mass of 2.5 multiplied by 10^5 kg, collide and stick together. One was initially moving at 3.4 m/s and the other was at rest. What is their final speed?

### Physics or Science?

Why liquid soap dispensed through a small spout by pressing on it, solidifies interfering with its smooth ejection? thanks so much for an answer! Pietra

### physics

race car travels on racetrack at 38m/s and slowa at a constant rate of 20m/s over 10s how far does it move during this time

### Physics

Which of the following physical properties can be used to measure temperature using a thermometer? A. volume B. pressure C. density D. viscosity I think the correct answer is D?

### physics

Two freight cars, each with a mass of 3.9 105 kg, collide and stick together. One was initially moving at 3.2 m/s and the other was at rest. What is their final speed in m/s?