# Homework Help: Science: Physics

## Recent Homework Questions About Physics

**Physics**

A rocket of mass 50 kg is launched vertically. Its fuel is being burnt at a rate of 2 kg s-1 and its exhaust gas is being forced out with a speed of 1000 m s-1. What is the initial acceleration of the rocket?

**Physics**

Calculate the skid-to-stop of a car travelling oa a road at 100km/h with a coefficient of friction of 0.68.

**Physics**

A body is partially submerged in a liquid. How to find the value of v/V where V=volume of the solid and v=volume of the submerged part ?

**Physics**

A rocket is ignited and gone up. After that it returns to the ground. How to draw a displacement time of the same ?

**PHYSICS**

Two tugboats are towing as barge. Each exerts a force of 5.0 tons and the angle between two ropes is 30 degrees. Find the resultant force exerted the barge.

**Physics**

a ship is headed towards east at a thrust speed of 7.00 knots. A strong wind pressure causes the ship to deviate to the north at 1.00 knots. The sea current is flowing to the southwest at 4.00 knots. Determine the velocity of the ship relative to the earth's surface.

**Physics**

A block of mass m1= 3.70kg rests on a 30degree incline and is held stationary by a mass of 1.3kg hanging vertically over a frictionaless pulley at the top. Calculate the value of u (coefficent of friction)

**physics**

A balloon was released at sea level from the bottom of a building and retrieved at the top of the building. Its volume changed from 500 cm^3 to 510 cm^3. The pressure at sea level is 100 kPa. If the density of air is constant at 1.29 kg/m^3, what is the height of the building?

**Physics**

Throw a stone straight up in the air. At its highest height what is its speed? Is it accelerating then?

**Physics**

A student with mass 55 kg jumps off a high diving board. Using 6.0×10^24 kg for the mass of the earth, what is the acceleration of the earth toward her as she accelerates toward the earth with an acceleration of 9.8 m/s2 ? Assume that the net force on the earth is the force ...

**Physics**

The average distance between the earth and the sun is 1.50X10^8 A. calculate the average velocity in km/h of the earth along its original path The average distance between the earth and the sun is 1.50X10^8 B. convert your answer from km\h to m\s. Show all units.

**Physics**

A football player runs the pattern given in the drawing by the three displacement vectors A, B, and C. The magnitudes of these vectors are A = 5.0 m, B= 15 m, and C = 18 m. Using the component method, find the magnitude and direction è of the resultant vector

**physics**

A highway curve forms a section of a circle. A car goes around the curve. Its dashboard compass shows that the car is initially heading due east. After it travels 620. m, it is heading 30.0° south of east. Find the radius of curvature of its path.

**Physics**

Given Two parallel plate capacitors with a seperation d(metres) in free space connected to a dc supply of volts,v. A dielectric material of thickness b(metres) is inserted between the plates so that a distance (d-b)m remains without dielectric. Show that the the pd per unit ...

**physics**

A car is moving at 25.0m/s on a straight highway lane. 10.0m in front of the car is a van that is travelling with the same speed. The van’s driver suddenly hits the brakes to avoid an obstruction, slowing down at a rate of 9.00m/s². The car’s driver reacts 0.85s later, ...

**physics**

a body of mass 2kg starting from origin t=0,has an initial velocity of 5m/s along x-axis and it subjected to constant force of 4N in y-direction in a gravity free space.the distance from origin after 4 seconds is nearly equal to

**Physics**

a batman deflects a boy by an angle 90 without change in acc. speed of 54km/h if mass of ball is 0.15kg. what is the impulse exerted on the ball also find force exerted on ball if ball remain for 0.1sec In connected with wall?

**Physics**

Calculate the skid to stop distance of a car traveling on a road at 100 kilometers per hour with a coefficient of friction of 0.68.....

**Physics**

Calculate the skid_to_stop distance of a car traveling on a road at 100 kilometers per hour with a coefficient of friction of 0.68...

**physics**

If I bring a 500 gauss magnet near to a 50 gauss magnet to repel them each other.will then both magnets repel each other with equal force or the 500 gauss magnet will repel 50 gauss magnet to more distance?

**ma**

In a class of 100 students, 40 failed in Math, 30 failed in Physics, 60 failed in Chemistry. 35 passed in both Math and Physics. 20 passed in Physics and Chemistry. 25 passed in Math and Chemistry. Each student passed in at least one subject. How many students passed in all ...

**Physics (College)**

A student rides her bicycle home from physics class to get her physics book and then heads back to class. It takes her 21.0 min to make the 12.8 km trip home and 13.0 min to get back to class. Calculate her average speed for the round-trip. Answer must be converted to km/h I ...

**Physics**

A car moves with 60km/h in first one hour and with 80km/h in next half an hour. Find 1. Total distance travelled by the car. 2. average speed of car in total 1.5 hours.

**Physics**

The speed limit on a nearby road is 25 mph what is the speed and meters per second

**physics**

Vector has a magnitude of 113 units and points 34.0 ° north of west. Vector points 63.0 ° east of north. Vector points 17.0 ° west of south. These three vectors add to give a resultant vector that is zero. Using components, find the magnitudes of (a) vector and (b) vector...

**Physics**

The Olympic record for the marathon set in 2008 is 2 h, 6 m, 32 s. The marathon distance is 26 mi. What was the average speed of the record-setting runner in km/h?

**physics**

How do the laws of physics apply to others sciences such as biology chemistry and earth science? And give an example to show the connection.

**Physics**

Suppose you can throw a ball a maximum horizontal distance L when standing on level ground. How far can you throw it from the top of a building of height h = L if you throw it at 27.9 degrees? (Ignore your height and any effects due to air resistance.)

**Physics**

A boat that can travel at 3.0 km/h in still water crosses a river with a current of 1.7 km/h. At what angle must the boat be pointed upstream to travel straight across the river?

**physics simple harmonic motion**

A particle moving in simple harmonic motion passes through the equilibrium point (x=0) 8 times per second. At t=0 its velocity at x=0.015m is negative. It travels 0.6m in a complete cycle. The particle's position as a function of time is described by the following function: x(...

**Physics**

A ball is thrown off a cliff that is 10 meters tall. The horizontal speed of the ball is 8 m/s. Assuming no air resistance, how far from the base of the cliff will the ball land?

**Physics**

Vector V1 is 6.6 units long and points along the negative x axis. V2 is 8.5 units long and points at +55 degrees to the positive x axis. A) What are the x and y components of each vector? B) Determine the sum of vector 1 and vector 2. (magnitude and angle) I have solved the ...

**physics**

A thin non-conducting rod is bent to form the arc of a circle of radius a and subtends an angle at the center of the circle. A total charge q is spread uniformly along its length. Find the electric field at the center of the circle in term of, a, q, and angle.

**physics**

a particle having a charge of -2.0 x 10^-9 is acted on by a downward electric force of 3.0 x 10^-6 in a uniform electric field. what is the magnitude and direction of the electric force exerted on a proton placed in this field. what is the gravitation force on the proton. what...

**Physics**

Two solids A and B float in water .A floats with half of its volume immersed and B float s with 2/3 of its volume immersed.the ratio of their densities is ?

**Physics**

An aircraft is fired vertically upwards with a muzzle velocity of 100m/s calculate : A)the maximum height it can attain B)the time taken to reach this height

**Physics (Momentum and collusion)**

Two balls of equal mass undergo a collision. Ball one is initially travelling horizontally with a speed of 10 m/s, ball two is initially at rest. After the collision, ball one moves away with a velocity of 4.7 m/s at an angle of 60 degrees from it's original path and ball two ...

**physics**

An object 4cm high is placed 25cm from a covering lens of focal length 15cm the image height is

**Physics**

A student says a speed of 50 m/s is faster than a speed of 140 km/h because the number is bigger. what would you say to them?

**Physics**

A 1500 kg car is travelling at 20 m/s. It brakes to a stop causing the brake pads to heat up from 25 degrees Celsius to a temperature too hot to touch. The total mass of the pads altogether is 4.0 kg and their heat capacity is 8.9 x 102 J/kg0C. If these pads are removed from ...

**physics**

a car is moving at 17.7 m/s when it begins to slow down with a deceleration of 2.5 m/s2. how long does it take to travel 20 meters as it slows down

**physics**

Find the resultant of the following two displacements; 2.0 m 40 degrees 4.0 meters at 127 degrees. the angles are taken relative to the x-axis

**Science**

500g of water at 100°c is mixed with 300g of water at 20°c.specific heat capacity of water is 4.2Jg°c.find the final temperature of mixture. (Physics)

**Physics**

Is KNO3 soluble in KOH solution?

**physics**

How much force will be required to move a seesaw system which is balanced with 50 kg weight on both side to move it 4 centimeter towards up and down side (linear motion).

**physics**

how much output I can get if a coil having 100000 turns moves pass a strong 3000 gauss neodymium magnet only once a time?

**Physics**

Mars, on average, is 140 million miles from the Sun. 1 mi = 1609 m . Part #1: Express the distance between Mars and the Sun in meters using powers of 10. Express your answer using two significant figures. Answer: d =2.25×10^11 m Part #2: Express the distance between Mars and ...

**Physics**

Ho can I calculate the volume of a CD that is 0.75 mm thick has outer diameter of 128 mm and inner diameter of 15 mm.

**Physics**

Calculate the work done by a 300N Force moving a 20kg object a distance of 50m

**Physics**

A car travel from a to b at 60km and return to a at 90km. What is the average velocity and average speed ?

**Physics (EMI)**

A metal disc of radius R rotates with angular velocity Omega (w) about an axis perpendicular to its plane passing through its centre in a magnetic field B acting perpendicular to the plane of the disc calculate the induced EMF between the rim and the axis of the disc

**physics**

How much energy will be required to move a balance system to move it 4 centimeter towards up and down side (linear motion).

**physics (Simple harmonic motion)**

X(t)=0.142sin(2t+0.19) b) Find the travelled distance by block at t2=3.5min [37.963m].

**physics (Simple harmonic motion)**

In a horizontal block-spring system,the block mass is m=0.5kg and the spring constant is k =2N/m. At t1=0.1s the block velocity is +0.263m/s and the acceleration is -0.216m/s2. Assuming that the system is undergoing SHM.Write the expression for block displacement from ...

**Physics**

An airplane with a mass of 1.20x10^4 kg tows a glider with a mass of 0.60x10^4 kg. if the airplane propellers provide a net forward thrust of 3.60x10^4, what is the acceleration of the glider? I'm thinking that I should add the masses and then solve using the equation Fn=ma ...

**Physics**

A car uniformly accelerates from rest at 3 m/s^2 for 8 seconds. At the end of the 8 seconds the car uniformly brakes at -5m/s^2 for 4 seconds. What total distance is traveled by the car during the 12 seconds of motion?

**Physics**

A child throws a small ball vertically upwards. The ball is caught at the initial height 1.8 seconds after being thrown. What was the net displacement for the ball? What was the initial speed of the ball? What was the final speed of the ball? How high did it rise?

**Physics**

A ball is thrown straight up at an initial speed of 24 m/s. How long did it take to reach maximum height? How high did it rise before falling again? I am confused on how to attempt this problem. Please provide me with some guidance:)

**Physics**

PhysicsA race car travels northward on a straight, level track at a constant speed travels 0.755 km in 18.0 s. The return trip over the same track is made in 23.0 s. (a) What is the average velocity of the car in m/s for the first leg of the run? 41.94 Correct: Your answer is ...

**Physics**

In general, what conditions with observable effects make magnets interact with non-magnet materials?

**Physics**

A race car travels northward on a straight, level track at a constant speed travels 0.755 km in 18.0 s. The return trip over the same track is made in 23.0 s. (a) What is the average velocity of the car in m/s for the first leg of the run?

**Physics**

a ball is dropped from the top on an 80-m high building. what speed does the ball have in falling 3.5 s? I keep getting the answer 34.3m/s but it is counted wrong. I found an answer on Chegg that say 29.4 m/s but I can't figure out how they are getting that answer.

**Physics**

A hot-air balloon is rising straight up with a speed of 3.0 m/s. A ballast bag is released from rest relative to the balloon when it is 9.5 m above the ground. How much time elapses before the ballast bag hits the ground?

**science ( physics )**

Two cars A and B are seprated by a distance of 0.5 km and moving in the same direction with same speed. A car C moving with 10 km/h in opposite direction meets these cars at an interval of 1 minute. The speed of A and B is

**physics**

a diver of mass 60kg stands on the end of a diving board of mass 30kg and length 2m. calculate the force exerted by the spring 30 cm away from the pivot. (i think that the force asked is 300N since W=mg (30×10)) hence, calculate the upward reaction force at the pivot and ...

**College Physics**

At what voltage would a 9 μF capacitor have the energy to lift 3 grams by 1 cm? i understand i need the0.5CV^2 equation however I don't know how to answer this

**Physics**

you toss a racquetball directly upward and then catch it at the same height you released it 1.90 s later. Assume air resistance is negligible.What is the acceleration of the ball while it is moving upward?What is the acceleration of the ball while it is moving downward?What is...

**physics**

A soccer ball is released from the top of a smooth incline. After 4.54 s the ball travels 8.1 m. One second later it has reached the bottom of the incline. Assume the ball's acceleration is constant and determine its value ( m/s2). How long is the incline?

**Physics**

An airplane has an airspeed of 950 km/h due east. There is a crosswind blowing in a direction of 550 south of east at 85 km/h. Calculate the velocity of the airplane relative to the ground.

**physics**

what is the difference beteewn resultant and equlibrium

**physics**

the mass of the density bottle is 18g when empty 44g when full of water and 39 when full of a second liquid. caculate the density of liquod?

**PHYSICS CLASS 9**

A car moves at a speed of 40km/h, It is stopped by applying brakes which produces a uniformacceleration of -0.6m/s2. How much distance will the vehicle move before coming to stop?

**Physics**

Write 2.38x10 to the 6th power in standard notation

**Physics**

How much work is required to lift a bag of wheat (mass 50kg) to a height of 2.4m?

**Physics**

A small car has a mass of 300 kg and it is brought to rest in 4 seconds from a speed of 20 metres per second.If there is no resistance to motion,find the force exerted by the brakes

**physics**

The periodic time of simple pendulum varies directly as the mass(m) of a Bob, length (l) of the place where the pendulum is suspended. determine the expression of periodic time(t)

**Physics**

A squash ball typically rebounds from a surface with 25% of the speed with which it initially struck the surface. Suppose a squash ball is served in a shallow trajectory, from a height above the floor of 39 cm, at a launch angle of 6.0° above the horizontal, and at a distance...

**Physics**

The roof of a two-story house makes an angle of 29° with the horizontal. A ball rolling down the roof rolls off the edge at a speed of 4.5 m/s. The distance to the ground from that point is 8.2 m. (a) How long is the ball in the air? (b) How far from the base of the house ...

**physics**

you are driving home from school steadily at 95 km/h for 180 km. It then begins to rain and you slow down to 65 km/h. You arrive home after driving 4.5 hours. How far is your hometown from school? x=180km + (95km/h)(4.5h) + (1/2)(-30km/h)(4.5h)^2 I calculated 303.75 km, but my...

**Physics**

An archer fires an arrow, which produces a muffled "thwok" sound after it hits a target. If the archer hears the "thwok" exactly 1.2 s after firing the arrow and the average speed of the arrow was 48 m/s, what was the distance separating the archer and the target? Use 340 m/ s...

**physics**

a charge of 6mC is placed in each corner of a square 1m on each side. determine the magnitude and direction on each side

**Physics**

Need someone to check my work and answers: At the instant the traffic light turns green, a car that has been waiting at an intersection starts ahead with a constant acceleration of 2.80 m/s2. At the same instant a truck, traveling with a constant speed of 20.0 m/s, overtakes ...

**Physics**

A student travels 300m towards North and then 400m towards East to reach his school. Calculate the distance of his school from his home.

**Physics**

The first meters of a 100-meter dash are covered in 2 seconds by a sprinter who starts from rest and accelerates with a constant acceleration. The remaining 90 meters are run with the same velocity the sprinter had after 2 seconds. a. Determine the sprinter's constant ...

**PHYSICS**

Runner A is initially 5.3 km west of a flagpole and is running with a constant velocity of 8.1 km/h due east. Runner B is initially 4.7 km east of the flagpole and is running with a constant velocity of 7.8 km/h due west. How far are the runners from the flagpole when their ...

**physics**

Runner A is initially 5.3 km west of a flagpole and is running with a constant velocity of 8.1 km/h due east. Runner B is initially 4.7 km east of the flagpole and is running with a constant velocity of 7.8 km/h due west. How far are the runners from the flagpole when their ...

**Physics**

At which point or points is the electric field zero in figure? I can not post the picture, but this is what it looks like: 1 2 3 4(4+)5 6(-)7 8 9 10 The (4+) is a proton with 4 charges. The (-) is an electron with 1 charge. They are on a number line 1-10. The proton is between...

**physics**

Runner A is initially 6.0 km west of a flagpole and is running with a constant velocity of 7.8 km/h due east. Runner B is initially 4.2 km east of the flagpole and is running with a constant velocity of 7.6 km/h due west. What will be the distance of the two runners from the ...

**physics**

Find the density of the earth if its mass is 6×10^3kg and radius is 6.4×10^3km

**physics**

A 1000-kg airplane moves in straight flight at constant speed. The force of air friction is 1800 N. The net force on the plane is ?

**physics**

A wire of nichrome of length 80cm has a resistance of 50 ohms. if the wire is four folded, find new resistance.

**Physics**

A car, in overtaking trailer, uniformly accelerated its speed from 40 kph to 90 kph in 8 seconds. Calculate the distance traveled during the period of acceleration.

**Physics**

Hi everybody! I need this quick answer, please help! The beam AB in the figure has length 3L and uniform section stiffness EI. The beam is fixed at A(x=0) and loaded by an upward concentrated force, P, applied at its free end B(x=3L). A concentrated moment Q is also applied, ...

**Bio physics chemistry pre medical**

Methane react with steam to form h2 and co. . what volume of h2 can be obtained from 100cmcube of methane at the standard temperature and pressure? ?

**Bio physics chemistry pre medical**

The vitamin a has a molecular formula c 20 h 30 o. How much no of molecules will be vitamin a has in 500mg capsule?

**Bio physics chemistry pre medical**

Vitamin a has a molecular formula c 20 h 30 o. How much no of molecules will vitamin a contian in 500mg capsule? ? Plz tell me now tomorrow is my test .I will be very grateful of u. .

**physics**

a ball projected vertically upwards from the top of the tower 60 meters high with a velocity of 30 meters per second. what is the maximum height above the ground? how long does it take to reach the ground?

**Physics**

Initial Statement: A soccer ball is kicked with an initial horizontal velocity of 15 m/s and an initial vertical velocity of 14 m/s. 1) What is the initial speed of the ball? 20.518 2) What is the initial angle θθ of the ball with respect to the ground? 43.025 3) ...

**physics**

Simpson drives his car with an average velocity of 48.0 km/ to the east. How long will it take him to drive 144 km on a straight highway?

**Physics**

Michael flies in an airplane due north to Michigan. The pilot encounters a direct crosswind from the west of 120 mph. What direction must the pilot steer in order to end up with a resultant of due north and average velocity of 120 mph? Measure and calculate the speed of the ...