# Homework Help: Science: Physics

## Recent Homework Questions About Physics

**Physics**

A uniform meter rule is balanced at the 30cm mark when a load of0.8 newtons is hung at the zero mark .at which point is the center of gravity.

**Physics**

Using Coulomb's law to solve: Charge A is +2.0x10^-6C and charge B is +3.0x10^-6C. The two changes are 3 m apart. What is the force between them?Is the force attractive or repulsive? Okay so here's what I have so far (2.0x10^-6)(3.0x10^-6)/(3)^2 It is confusing me with the ...

**physics**

a) a driver of mass 55kg needs to jump to a height of 1.1m above her take off height, at which point her speed needs to be 0.5m/s^. How fast just she be travelling the instant her feet leave the diving board? So we know eg=mgh =9.8*55*1.1 I assumed we're trying to find the ...

**Physics**

Determine the amount of work required for each of the following: a) to lower a 35kg sack of rice through a height of 3.5m b) to carry the 30kg sack of rice 10m along a corridor c)to crave the sack of rice 15m along the corridor at a constant velocity against a frictional force...

**physics**

Driving in your car with a constant speed of v= 22 m/s, you encounter a bump in the road that has a circular cross-section, as indicated in the figure (Figure 1) . Part A If the radius of curvature of the bump is 52 m, find the apparent weight of a 66-kg person in your car as ...

**PHYSICS**

Two springs, with force constants k1=175N/m and k2=270N/m, are connected in series, as shown in (Figure 1) . Part A: When a mass m=0.50kg is attached to the springs, what is the amount of stretch, x? k1 I k2 I m ? ] x

**physics help**

At a playground, a 20-kg child sits on a spinning merry-go-round, as shown from above in (Figure 1) . The merry-go-round completes one revolution every 6.2 s, and the child sits at a radius of r=1.8m. a) What is the force of static friction acting on the child? b) What is the ...

**Physics**

3 particles of masses m1 = 1.5 kg , m2 = 2.5 kg and m3 = 3.5 kg form an equilateral triangle of edge length l= 135 cm. Determine the center of mass of the system.

**Physics**

Max has a mass of 65 kg and sits in a canoe that has a mass of 55 kg. He jumps with a horizontal velocity of 2m/s towards the shore. What is the velocity of the canoe?

**physics**

A steel wire is used to lift heavy object. The cable has a diameter of 14.25 mm and an initial length of 33.5 m. If the cable stretches 2.50 mm, what is the mass of the heavy object? Use 20.0 x 1010 Pa for Young’s modulus for steel. Give your answer in kg and with 3 ...

**Physics**

A wheel mounted on a stationary axle starts at rest and is given the following angular acceleration: 9-12t where t is the time after the wheel begins to rotate. Find the number of revolutions that the wheel turns before it stops ( and begins to turn in the opposite direction).

**Physics**

A 0.250 kg ball swung on a 1.3 m string in a vertical circle. If it's tangential speed at the bottom of the path is 4.2 m/s, what is the maximum speed the ball can have at the top and still move in a circle?

**Physics**

What is the mass of water that has its temperature raised from 27°C to 32°C when it is heated by 5.0 x 106 J of heat energy?

**Physics**

Okay, I'm really confused in general. My question says: "A solid piece of clear transparent material has an index of refraction of 1.61. If you place it into a clear transparent solution and it seems to disappear, approximately what is the index of the refraction of the ...

**Physics**

In the figure, the meterstick's mass is 0.130 kg and the string tension is 2.30 N . The system is in equilibrium. A) Find the unknown mass m. B) Find the upward force the fulcrum exerts on the stick. I found part A and the answer is .634kg but I can not figure out part B.

**Calc. Based Physics**

10.1 Three uniform spheres with masses m1 = 6.0 kg, m2 = 2.0 kg , and m3 = 4.0 kg are fixed at the positions shown in the diagram. Assume they are completely isolated and there are no other masses nearby. m_1 | | 3cm | m_2-- P ^ | 1cm |2cm m_3 (a) What is the magnitude of the ...

**PHYSICS**

Two tugs are towing a ship at Constant speed against a total resistance of 50KN. The angles between the tow ropes and the direction of moment are 30degree and 60degree respectively. What is the tension in each of the tow ropes?

**Physics**

A 200h bag of potato chips contains 4.8MJ of energy. How long would it take you working at your maximum body power to consume this energy? So we did 2 trials where we ran up the stairs, and my final power for 1 was 246W and for the other it was 338W. So I assume you divide the...

**Physics**

How many calories are needed to heat 247 grams of ice at 14F to water at 50C? s(ice)=0.500kcal/kg/C, s(water)=1.000kcal/kg/C ,hf= 79.7kcal/kg, hv= 540 kcal/kg

**physics help**

Driving in your car with a constant speed of v= 22 m/s, you encounter a bump in the road that has a circular cross-section, as indicated in the figure. If the radius of curvature of the bump is 52 m, find the apparent weight of a 66-kg person in your car as you pass over the ...

**physics**

Two springs, with force constants k1=175N/m and k2=270N/m, are connected in series When a mass m=0.50kg is attached to the springs, what is the amount of stretch, x?

**Physics**

A train blows its horn as it approaches a crossing. A.) if the train engineer observes a frequency of 125Hz and a stationary observer at the crossing observes a frequency of 132Hz, what is the speed of the train? (The speed of sound is 330m/sec on this day). B.) what frequency...

**Physics**

Two resistors each of 15 Ohm and 10 Ohm are in parallel, find the effective resistance

**Physics**

Hello so my question is an 85kg kangaroo acquires 2.2kJ of energy in jumping straight up and down from rest. How high does the kangaroo jump? My solution: When he's at rest Eg=2200J but in air Eg=0 Eg=mhh 2200=85(9.8)h 2.64m=h Looking at it now it doesn't really make sense ...

**Physics**

A 240 kg roller coaster car Rolls over the crest of the roller coaster with a speed of 2.2m/s.if it falls through a vertical height of 12m down the tracks to the bottom of a trough, how fast will it be travelling? So here's what I did but I don't think it's right: Eg=mgh =...

**physics**

Consider a ladder placed against a frictionless wall. What happens to the friction force between the ladder and the floor as you climb up the ladder? (Assume the ladder is not sliding.) A. The friction force decreases. B. The friction force remains the same. C. The friction ...

**physics**

Which force(s) provide(s) the centripetal force needed for a car to make a turn on a banked curve? A. Weight, only B. Tension, only. C. Friction, only. D. Coriolis force, only. E. Friction and normal force. Is it D?

**physics**

determine the center of mass for three particles(1.5, 2.5, 3.5) forming a equilateral triangle one side lenght of 135cm.

**physics**

what is the work done in moving a positive charge 12UC across two points 6cm apart

**AP physics (multiple choice)**

an object is undergoing uniform circular motion. which of the following statements is true? a. the velocity is constant b. the acceleration is constant. c. the a is constant but v varies. d. the v is constant but the a varies. E. both a and v vary.

**AP physics**

1000 kg car is going clockwise around a curve iwth radius of 30m. coefficient of frction=0.5 if the road was banded at an angle what would happen to the speed required or the radius of the curve? explain.

**Physics**

A 55kg arrow is fired vertically upward at a speed of 42m/s. It rises upwards, then drops and lands on the ground. If it lodges itself 12cm in the ground, determine the average force that the ground exerts on the arrow This is what I've done but I don't think it's correct: Eg=...

**physics**

A stone of mass 5kg is thrown vertically upwards with velocity 10ms final calculate the height.

**Physics**

Efficiency of a single fixed pulley is 85%.what effort is needed to lift a load of 85kgf using it?

**Physics 2**

a point charge q1=+9μc is held fixed at the origin. A second point charge with a charge of-5μC and mass of 3.2 x 10^-4 kg is placed on the + x-axis, 0.90 m from the origin. a.) What is the potential energy of the pair of charges? (consider the potential to be zero at ...

**physics**

a uniform meter rule is pivoted at 20cm mark . It is balanced when mass of 100gm on 10cm mark and mass of 50 gm on 30 cm mark are suspended. Find d mass of meter rule

**Physics - Voltage across a wire of unknown length**

Four copper wires of equal length L are connected to a 100V source. Their cross-sectional area are 1cm^2, 2cm^2, 3cm^2, and 4cm^2. Find the voltage across the 3cm^2 wire. Leave your answer in terms of L, it should cancel out. - So I tried using and equating various relevant ...

**physics**

A block of mass m = 3.53 kg is attached to a spring which is resting on a horizontal frictionless table. The block is pushed into the spring, compressing it by 5.00 m, and is then released from rest. The spring begins to push the block back toward the equilibrium position at x...

**physics**

fluid of constant density = 960 kg/m3 is flowing steadily through the above tube. The radius at the sections are r1 = 0.05 m, r2 = 0.04 m. The gauge pressure at 1 is P1 = 200 000 Pa and the velocity here is v1 = 5 m/s. We want to know the gauge pressure at section 2.

**physics**

Driving in your car with a constant speed of v= 22 m/s, you encounter a bump in the road that has a circular cross-section, as indicated in the figure. If the radius of curvature of the bump is 52 m, find the apparent weight of a 66-kg person in your car as you pass over the ...

**PHYSICS QUESTIONS**

Two springs, with force constants k1=175N/m and k2=270N/m, are connected in series, as shown in (Figure 1) .When a mass m=0.50kg is attached to the springs, what is the amount of stretch, x?

**physics**

A water main with a radius of 0.15 m contains water with an average velocity of 3 m/s .What is the flow rate in the water main?

**physics question**

When you take your 1700-kg car out for a spin, you go around a corner of radius 55 m with a speed of 20 m/s. The coefficient of static friction between the car and the road is 0.88.Assuming your car doesn't skid, what is the force exerted on it by static friction?

**PHYSICS**

When a 8.88 kg mass is placed on top of a vertical spring, the spring compresses 4.54 cm . Part A Find the force constant of the spring. 8.88kg*9.81=87.1128 divided by4.54 =19.187N/CM 0.0001918784141 KN/M IS IT RIGHT? PLS HELP

**physics homework**

When a mass m=0.50kg is attached to the springs, what is the amount of stretch, x? When a mass m=0.50kg is attached to the springs, what is the amount of stretch, x?

**physics**

At a playground, a 20-kg child sits on a spinning merry-go-round, as shown from above in (Figure 1) . The merry-go-round completes one revolution every 6.2 s, and the child sits at a radius of r=1.8m. a. What is the force of static friction acting on the child? b.What is the ...

**Physics**

A ray of light with wavelength 589 nm passes through an unknown material with a velocity of 1.94 x 10^8 m/s. What is the material? I think this problem has something to do with Snell's law, but there is no given angle of refraction so I don't know how to solve it. Thanks!

**Physics**

Ten cars at an intersection are blowing their horns simultaneously, creating a 100 decibel sound in the middle of the intersection. What is the average sound level for each car? 10/100= 10db per car?? Idk

**physics**

A 30 ohm resistor is connected in parallel with a variable resistance R. The parallel combination is then connected in series with a 6 ohm resistor and connected across a 120 V source. Find the minimum value of R if the power taken by R is equal to the power taken by the 6 ohm...

**Physics**

A 30 ohm resistor is connected in parallel with a variable resistance R and the parallel combination is then connected in series with a 5 ohm resistor, and connected across 120 volt source. Find the minimum value of R if the power taken by R is equal to the power taken by the ...

**physics**

the Ferris wheel has a diameter of 150m and takes 30min to make a full circle. Determine the speed of ride in m/s

**Physics 2**

α of gold is 14.3x10^-6/C°. The density of gold is 19.3 g/cm^3 at 20℃. Determine its density at 140℃.

**Physics**

A 10 kg mass is hung from 2 light, inextensible strings such that the vertical string is attached to the top of the block at an angle 60 degree and the other string is attached straight horizontally to the adjacent side of the mass. How do we solve the tension in the ...

**Physics**

With the center of a meter stick place on a knife edge balance and a 2N weight hanging on its 100cm mark, where should a 5N weight be placed to keep the meter stick in static equilibrium.

**AP physics**

how do i find the Fnet of 3 planets? the 3 planets are also at angled distance from one another(2d).

**Physics**

Equation for d. A car has a speed of 17 m/s how long will it take to go 20 m

**physics**

Consider a plane pulling up from a downward dive. If the plane has a speed of 85 m/s at the bottom of the dive and the radius of curvature of the dive is 240 m, what is the normal force on a 78 kg pilot at the bottom of the dive? A. 770 N B. 790 N C. 1600 N D. 2300 N E. 3100 N

**Physics**

Find the distance of the image when an object is placed on the principal axis at a distance of 10 cm. In front of concave mirror whose radius of curvature is 8 cm

**Physics-Heat**

Calculate and compare the temperature changes of copper (specific heat of 0.09c/gC) to glass (Specific heat of 0.20 c/gC) when 535 g of each substance are given 1,500c of thermal energy.

**physics**

A typical magnitude of the external magnetic field in a cardiac catheter ablation procedure using remote magnetic navigation is B = 0.080 T. Suppose that the permanent magnet in the catheter used in the procedure is inside the left atrium of the heart and subject to this ...

**physics**

four point charges on corners of a square.. top left -1, top right +2, bottom left -2, bottom right -1 ... object in middle is -1 ... which direction will that object move? up, down, left, or right (no angles)

**AP physics (answer whatever you can)**

how do you find the Fnet of 3 planets? do i find the forces of all the planets on each other and add it up? what if teh planets are at an angled position? 1000 kg car is going clockwise around a curve iwth radius of 30m. coefficient of frction=0.5 if the road was banded at an ...

**Physics**

A half pipe can be thought of as half of a cylinder with radius of 7.00m. If a skater with mass 75.0 kg, starts with an initial velocity of 5.00 m/s at the top of the ramp, (a), what is his velocity at the very bottom of the ramp? The skater then approaches the other quarter ...

**physics**

Two small balls are attached to a rigid rod of mass 2.2 kg that is 6.0 m in length. The first ball has a mass of 2.25 kg and the second ball has a mass of 4.95 kg. (c) What is the moment of inertia of the rod when it spins around its center of mass?

**physics**

Consider the directions of the velocity and the acceleration vectors of an object in uniform circular motion. A. Both vectors point away from the center. B. The velocity points along the tangent, and the acceleration is zero, since the speed is constant. C. The velocity points...

**Physics**

Two point charges that have charge values of 4.0 X 10^-6 C and -8.0 X 10^-6 C, respectively, are separated by 2.4 X 10^-2 m. What is the mutual force between them, given that kC = 8.99 X 10^9 Nm^2/C^2? I got the Felectric as -5.0 X 10^2 N, but I'm not sure if that value is ...

**physics**

the potential energy of a spring..when stretched by 4 cm is u..when stretched by 20 cm it will ?

**Physics**

A 2.5kg block is on 53° inclined plane for which coefficient of kinetic friction is 0.25 and coefficient of static friction is 0.5. Calculate its acceleration given that: (a)it is intially at rest (b)it is moving up the slope

**Physics**

A blue billiard ball with mass m crashes into a red billiard ball with the same mass that is at rest. The collision results in the blue billiard ball travelling with a velocity of v and the red billiard ball with a velocity of 3V. In terms of v and m determine the blue ...

**Physics**

Let F1=10i-15j-20k,F2=6i+8j-12k. Find their dot product and the angle between those two vectors

**Physics**

A square-shaped loop carries current I. What is the magnitude and the direction of the magnetic field at point P, which is located on the bottom segment of the loop? Each side of the square loop has length d. The answer should be given in terms of d, I, pi, and the ...

**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 square-shaped loop carries current I. What is the magnitude and the direction of the magnetic field at point P, which is located on the bottom segment of the loop? Each side of the square loop has length d. The answer should be given in terms of d, I, pi, and the ...

**physics**

a car acclerate uniformly from rest andattains a speed of 40m/sin 10second itcoversa distanceof

**Physics**

Find the centripetal acceleration of a car that rounds an 80 m radius curve at 10 m/s.

**physics/maths help damon or steve or scott**

A body moves in a straight line,with initial velocity and uniform acceleration.find how far it travels in 12sec.,given that it travels 246m in the first 6 sec.,and 69m in the last 3sec.find the initial velocity. Please show step

**Physics**

A car is traveling on a level horizontal rode comes to a bridge during a storm and finds the bridge washed out. The driver must get to the other side, so he decides to try leaping it with his car. The side of the road the car is on 21.3m above the river, while the opposite ...

**Physics**

A car is traveling on a level horizontal rode comes to a bridge during a storm and finds the bridge washed out. The driver must get to the other side, so he decides to try leaping it with his car. The side of the road the car is on 21.3m above the river, while the opposite ...

**maths**

3. Suppose a bookcase shelf has 5 Mathematics texts, 3 Biology texts, 6 Chemistry texts and 4 Physics texts. Find the number n of ways a student can choose: a. one of the texts; b. one of each type of text.

**physics**

Agalvanometer of resistance 25 ohmes shows full scale deflection for current of 10mA, to convert it into 100 V range voltmeter , the required series resistance is

**Physics**

A spring is compressed a distance of 'x' stores 500J of energy. How much energy is stored in the spring if it is compressed a distance of 4x?

**physics**

Considering the factors that affect gravitational pull, in which location would the gravitational pull from the earth be SMALLEST on you? A) visiting friends at the beach B) visiting Santa on the second floor of the mall C) visiting Uncle Chrissy in the Himalayan Mountains D) ...

**angular velocity/ physics**

how to find time period in angular velocity if body is equal to twice of the radius of the gravity

**angular velocity/ physics**

in 10s a fan rotates 500 rotation times angular velocity is

**Physics**

How long does it take a car to change it velocity from 15m/s if it accelerarate uniformly at 5m/s square?

**modern physics**

Calculate the commutator [ p, e^ik.x ] where the function e^ik.x may be expanded as: e^ik.x = ∑infinite,n=0 (ik.x^n/n!)

**modern physics**

Missiles are fired towards the earth from a spacecraft. The missiles are moving with a speed of 0.8c with respect to the spacecraft. If the spacecraft itself has a speed of 0.3c with respect to Earth, how fast are the missiles observed to travel with respect to Earth? What ...

**modern physics**

Supersonic jets are able to achieve maximum speeds of up to 3.0 × 10-6c. Calculate the percentage contraction in the length of a jet plane travelling at this speed.

**modern physics**

The earth and the sun are 8.3 light-minutes apart in the same inertial frame. Two events occur at t = 0 on the earth and t = 3 minutes on the sun respectively. Calculate the time difference between the events according to an observer moving at u = 0.6c from the earth to the ...

**Physics**

A Car is travelling 20m/s when it pulls out to pass a truck that is travelling at 18 m/s. The car accelerates at 2.0m/s^2 for 7.0 seconds B) What is the car's speed at the end of the period of acceleration? Vi=20 m/s Vf=18 m/s a= 2.0m/s^2 t=7.0 Seconds I am unsure what formula...

**Physics**

an empty measuring cylinder weighs 100g. When it contains 20cm^3 of liquid it weighs 120 g. a) What is the density of the liquid?

**physics**

An arc lamp operates at 80V . suggest a method to use it with 240 V d.c. source

**Physics/Mechanics**

A particle A of mass 150g lies at rest on a smooth horizontal surface. A second particle B of mass 100g is projected along the surface with a speed of u m/s and collides directly with A. On collision the masses coalesce and moves on with a speed of 4 m.s . find the value of u ...

**physics**

An arc lamp operates at 80V . suggest a method to use it with 240 V d.c. source

**Physics**

A transverse wave is formed on a long skipping rope. The equation of the transverse wave is y=5.50 sin(0.031π x+5.52π t) where x and y are in centimeters, t is in seconds, and Π is pi (3.14..). Find the amplitude of the wave? what is the wavelength of the transverse wave? ...

**physics**

How do you draw a force diagram for an object that is tied to a pole and is moving in a constant circular direction?

**Physics**

What is the direction of the displacement of a person who walks 10 km at 37 degrees south of east, then 14 km due west?

**Physics**

At what acceleration would you expect the blood pressure in the brain to drop to zero for an erect person? Why? (Assume there are no body mechanisms operating to compensate for such conditions)

**modern physics**

A radioisotope P has a half-life of 3 s. At t = 0, a given sample of this isotope contains 8000 atoms. Calculate (i) its decay constant, (ii) average life, (iii) the time t1 when 1000 atoms of the isotope P remain in the sample, and (iv) number of decays per second in the ...

**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)