# Homework Help: Science: Physics

## Recent Homework Questions About Physics

**Physics**

An object of mass 10kg is placed on an inclined plane at 30 degree to the horizontal. Calculate the reaction between two surface and what is the coefficient of static friction.

**Physics**

A 46−N lithograph is supported by two wires. One wire makes a 28° angle with the vertical and the other makes a 16° angle with the vertical. Find the tension in each wire.

**Physics**

5. You are hiking in a canyon and you notice an echo. You decide to let put a yell and notice it took 2 seconds before you heard the echo of your yell. How far away is the canyon wall that reflected your yell?

**physics**

The speed of sound in air is 350m/sec the frequency of the fundamental node emitted by tube length 50cm open one end is:

**Physics**

If someone pushes on a box on a horizontal floor with a horizontal force of 17.8 N, but the box does not move, what is the static friction (Fs) between the box and the floor? Explain. The next question is: If the box just starts to move with a horizontal force of 29.5 N, what ...

**PHYSICS**

Explain for each of the following, The Magnus force applies and how it causes an effect. a. A car tire rotating while a car drives. b. A tennis ball curves while moving towards the opposite side of the net. c. A tennis ball changes directions when it hits the ground. d. A ...

**Physics**

a 1 kg textbook has been pushed and let go sliding to the left on a flat table no one is pushing the book at this moment. it is sliding a. calculate the weight of the textbook? How do I do these calculations? b. based on this weight, what must the normal force from the table ...

**Physics**

pressure is force per area in a high wind the increased pressure inside of a skyscraper can be up to 29 lbs/ft2. calculate the wind load in pounds on the windward side of a 150 ft wide, 850 ft tall building. How much is this in newtons?

**Physics**

A red ball is thrown straight up from the edge of the roof of the building. A green ball is dropped from the same point 1.80 seconds later.a)if the height is 60.0 m, what is u(red)?b)if u(red) greater than u(max) determine u(max). Ive solved abut i cannot understand b, please ...

**Physics Force and Friction question**

A crate of mass 100kg is at rest on a horizontal floor. The coefficient of static friction between the crate and the floor is 0.4, and the coefficient of kinetic friction is 0.3. A horizontal force, F, or magnitude 350N is applied to the crate. Which of the following is true? ...

**Physics**

A 75.0 kg object is on an incline of 30 degrees horizontally. I have to calculate several things from this, and I need help with some of them. I have to find the following: 1. Static coefficient of friction 2. Kinetic coefficient of friction 3. Gravitational force 4. Normal ...

**physics**

A stone is thrown vertically upward with a velocity of 58 ft./sec. A.) How high will it rise? B.) How soon will it reach the ground again? C.) What is its velocity half-way up?

**Physics**

A satellite orbits the moon at height of 2000m.assuming it to gravitational pull of the moon,find the speed and time it takes for one orbit,given that mass of moon is 7.34 * 10 to power 22 kg and radius is 1.738 * 10 to power 6m.(g = 6.6 * 10 to power -11nm2/kg).

**dinesh physics**

a car start from rest and sccelerates uniformly at 2 ms-2 for 10s what is its velocity at the end of 10s

**physics**

A car travelled 7km40degree west of north and then 10km east.what is the resultant displacement using scale drawing

**Physics**

A superhero flies 185 m from the top of a tall building at an angle of 15◦ below the horizontal. What is the horizontal component of the superhero’s displacement? Draw the vectors to scale on a graph to determine the answer. Answer in units of m. Your answer must be ...

**Physics**

A truck travels beneath an airplane that is moving 150 km/h at an angle of 34◦ to the ground. How fast must the truck travel to stay beneath the airplane? Answer in units of km/h.

**Physics**

What is the direction of this resultant vector (between the limits of −180◦ and +180◦ from the positive x-axis) ? 1. −88◦ 2. −117◦ 3. −144◦ 4. −143◦ 5. −135◦ 6. −171◦

**Physics**

Consider two vectors F~1 with magnitude 69 N inclined at 177◦ and F~2 with magnitude 58 N inclined at 286◦, measured from the positive x axis with counterclockwise positive. What is the magnitude of the resultant vector F~1 + F~2 ? Draw the vectors to scale on a ...

**Physics**

A person walks 21 m East and then walks 34 m at an angle 32◦ North of East. What is the magnitude of the total displacement? Answer in units of m.

**physics**

The system shown below are in equilibrium with m = 2.90 kg If the spring scales are calibrated in newtons, what do they read? Ignore the masses of the pulleys and strings and assume the pulleys and the incline are frictionless. Image: imgur. com/a/GCJIL

**Physics**

A boy pushes a box of mass 20kg with a for every of 50N.What is the acceleration of the box

**Physics**

A boy starts with initial speed u and mouse in a straight line with constant acceleration it has been be after covering a distance 2S its speed just after covering distance s is

**physics**

A body is thrown at an angle 30 to the horizontal with the velocity of 30m/s.After 1 second,its velocity will be

**Physics**

A heat engine operating between a cold reservoir temperature of 300K and a hot reservoir takes 200J of heat from the hot reservoir and delivers 120J of heat to the cold reservoir in a cycle. The minimum temperature of the hot reservoir is :

**Physics**

A projectile is launched horizontally from a cliff and has initial speed 30 m/s. The projectile will hit the ground 10 s later. What is the horizontal component of the projectile's velocity 5.0 s after launch. Assume air resistance is negligible.

**physics**

The wavelength of first line of balmer series in hydrogen spectrum is 6563 A. Find the wavelength of first line of lyman series in the same spectrum.

**Physics**

A thin convex lens produce a real image on an a screen . if an object of height 36mm is placed 2000mm from the screen ,an image of height 684mm will be produced .determine A) the distance of the object from the lens B) the focal length of the lens

**Physics**

the mass of an empty density bottle is 4og and 5og when filled with liquid x.calculate the density of liquid x when dem

**Physics**

You are in an elevator that is accelerating upwards at 2m/s^2. If your mass is 70kg, what is the normal force pushing on you by the floor of the elevator? A. 70N B. 690N C. 830N Please give the correct answer and an explanation as to why its correct.

**Physics**

A crate of mass 100kg is at rest on a horizontal floor. The coefficient of static friction between the crate and the floor is 0.4, and the coefficient of kinetic friction is 0.3. A horizontal force, F, or magnitude 350N is applied to the crate. Which of the following is true? ...

**Physics**

Multiple Choice. If all of the forces acting on an object an object are balanced (net force is zero), then: a. The object's speed will decrease b. The object's direction of motion can change, but its speed cannot C. The object is ecperiencing zero acceleration Please explain ...

**Physics**

Why is the joule-second (J*s) equivalent to kg*m^2/s ?

**physics**

Starting from rest, a 93-kg firefighter slides down a fire pole. The average frictional force everted on him by the pole has a magnitude of 710 N, and his speed at the bottom of the pole is 3.2 m/s. How far did he slide down the pole? What equation do you use to determine this.

**physics**

A 50.4-g golf ball is driven from the tee with an initial speed of 45.7 m/s and rises to a height of 26.9 m. (a) Neglect air resistance and determine the kinetic energy of the ball at its highest point. (b) What is its speed when it is 7.80 m below its highest point?

**Physics**

I have a picture of one person pushing a boulder with 60 N and another person pushing from the same side at 90 N. The friction of the boulder is 40 N. The question asks to find the total force on the boulder. Is "total force" just the net force in this case or something ...

**Physics**

Block B has a mass of 4.50kg and is moving to the left at a speed of 4.50m/s. Block A has a mass of 6.50kg and is moving to the right. The two blocks undergo a perfectly inelastic collision. What should the velocity of the Block A be in order to have the two blocks move to the...

**Physics**

The 500 kg video display will be raised to its position 20 m above the arena floor by a motorized winch powered by a 12 volt battery. If the battery capacity is 100 A-hr and the system is 100% efficient, how many times could the display be lifted into position before the ...

**Physics**

A bowling ball rolls off the edge of a giant' table at 18 m/s. If it takes 6 s for the ball to hit the ground. A) How far does it land from the base of the table? B) how far does it fall?

**Physics**

A rock is thrown off a cliff with a vertical speed of 53 m/s upward and a horizontal speed of 30 m/s. A) what will these speeds Vx and Vy, be 4 seconds later? B) what will be the x and y displacements of the rock be 4 seconds later?

**Physics**

Al the astronaut has a weight of 1600 N when he is standing on the surface of earth. What is the force of gravity action on him when he is in space station orbiting earth at a distance of four earth radii from the center of the earth?

**Physics**

Angela and Paul are opposite ends of the 4.0 m long bar. Paul, whose mass is 78 kg feels attraction to Angela, whose mass is 55 kg. A: If the attraction is gravitational, how strong, in Newtons, is it? B: What are their individual weights?

**physics**

"Rocket Man" has a propulsion unit strapped to his back. He starts from rest on the ground, fires the unit, and accelerates straight upward. At a height of 16 m, his speed is 5.5 m/s. His mass, including the propulsion unit, has the approximately constant value of 139 kg. Find...

**Physics**

Starting from rest, a 1.7x10-4 kg flea springs straight upward. While the flea is pushing off from the ground, the ground exerts an average upward force of 0.45 N on it. This force does 1.9x10-4 J of work on the flea. (a) What is the flea's speed when it leaves the ground? (b...

**physics**

The concepts in this problem are similar to those in Multiple-Concept Example 4, except that the force doing the work in this problem is the tension in the cable. A rescue helicopter lifts a 89.2-kg person straight up by means of a cable. The person has an upward acceleration ...

**Physics**

A rock is thrown off a cliff with a vertical speed of 53 m/s upward and a horizontal speed of 30 m/s. A) what will these speeds Vx and Vy be 4 second later? B) what will be the x and y displacements of the rock be 4 second later?

**Physics**

A cyclist whose mass is 48 kg turns a corner with a radius of 30 m at a speed of 25 m/s. A) What is the magnitude of the cyclist's acceleration? B) what is the magnitude of the force action on the cyclist?

**physics**

What is the minimum work in joules needed to push a 1210 kg car 54.0 m up a 12.5 degree incline? (Ignore friction.)

**Physics**

Please show me how to work the following problems. 1) A cyclist whose mass is 48 kg turns a corner with a radius of 30 m at a speed of 25 m/s. A) What is the magnitude of the cyclist's acceleration? B) What is the magnitude of the net force acting on the cyclist? 2) A rock is ...

**physics**

A spring whose spring constant is 450 N/m is compressed 0.800 m. What speed (in meters/second) can it give to a 0.500 kg ball when released?

**Physics, ray optics**

An astronomical telescope of magnifying power 7, consist of two thin lenses 40 cm apart in normal adjustment. Find the focal length of the lenses.

**physics**

Two boxes are connected by a weightless cord running over a very light frictionless pulley as shown in the figure. Box A, of mass 8.0 kg, is initially at rest on the top of the table. The coefficient of kinetic friction between box A and the table is 0.10. Box B has a mass of ...

**Physics**

A man chased by the army, leaps with speed 12 m/s at a 47 degree angle above the horizontal from the top of a building. If he lands 40.0 m from the base of the building, then finds the height of the building

**Physics**

What is the centripetal acceleration of an automobile driving at 40 km/h on a circular track of radius 20m? Help ASAP please!!!

**Physics**

A mover finds that a 20 kg crate initially at rest requires a 75 N horizontal force to set the crate in motion, but only a 60 N force to maintain a constant velocity. Find a) the co-efficient of static friction between crate and floor. b) the co-efficient of kinetic friction ...

**Physics**

A plane leaves Seattle, flies 77.0 mi at 21.0 ∘ north of east, and then changes direction to 52.0 ∘ south of east. After flying at 124 mi in this new direction, the pilot must make an emergency landing on a field. The Seattle airport facility dispatches a rescue ...

**Physics**

If you jumped off a 25 meter cliff on the moon (gravity being 1.66) what would be a comparable hight of that cliff on earth? the answer and show me how to get it.

**physics**

A stone is thrown vertically upward at 23 m/s. How fast is it moving when it reaches 14 m?

**Physics**

A 5.7 g bullet leaves the muzzle of a riﬂe with a speed of 636.8 m/s. What constant force is exerted on the bullet while it is traveling down the 0.5 m length of the barrel of the riﬂe? Answer in units of N

**Physics 11**

An airplane flies at 500km/hr, there is a wind kf 50.0km/h(N).if the pilot wants to fly due east, calculate the direction that the plane is heading. Thanks.

**Physics**

An automobile leaves the store, first going south at 88 km/h for 2 hours, and then turns on a road heading 20 degrees east of north at 55 km/h for 1.5 hours. Calculate the (x,y) components of the net displacement of the automobile from the starting position, where the x-axis ...

**Physics**

a) A car accelerates uniformly from rest to a speed of 97.9 mi/h in 6.93 s.Find the constant acceleration of the car.Answer in units of m/s^2. b)Find the distance that the car travels during this time.Answer in units of m. How do you do this?

**Physics**

What minimum force is required to drag a crate (m = 40 kg) across a floor (co-efficient of kinetic friction = 0.6) if the force is applied at a 45 degree angle upward from the horizontal? Help ASAP please!!

**Physics**

A ball is thrown straight up at 45 m/s. How long will it take the ball to come back to its original height? Why?

**Physics**

A 2.0 kg wood block is launched up a wooden ramp that is inclined at a 25 ∘ angle. The block's initial speed is 14 m/s . The coefficient of kinetic friction of wood on wood is μk=0.200. What vertical height does the block reach above its starting point? What speed ...

**Physics**

At a certain instant an object is moving to the right with speed 1.0 m/s and has a constant acceleration to the left of 1.0 m/s^2.At what later time will the object momentarily be at rest? How do you do this?

**physics**

An airplane travels 250 km/h due West for 2 hours. Its average velocity is:

**Physics**

Two men pushing a stalled car generate a net force of +699 N for 7.13 s. What is the final momentum of the car?

**physics**

A water-skier is being pulled by a tow rope attached to a boat. As the driver pushes the throttle forward, the skier accelerates. A 71.6-kg water-skier has an initial speed of 5.8 m/s. Later, the speed increases to 11.8 m/s. Determine the work done by the net external force ...

**PHYSICS**

A 107 kg bix on the right and a 50 kg box on the left are tied together by a horizontal cable. The 107 kg box is acted upon by an external force of 598 N to the right. The frictional force exerted by the floor on the 107 kg box is 30 N and the frictional force exerted by the ...

**Physics**

A straight horizontal rope is towing a 5.52 kg toboggan across frictionless ice. A 2.76 kg radio is on top of the toboggan with a coefficient of static friction of 1.50 between the toboggan and radio. In order to prevent the radio from slipping, what is the largest force of ...

**Physics**

An antique cabinet is in the cab of a pickup truck traveling 20.1 m/s and has a coefficient of static friction of 0.250 between the antique and the cab. In the event of a sudden stop, what is the shortest distance the pickup truck can stop without having the cabinet move ...

**physics**

On her trip from home to school, Karla drives along three streets after exiting the driveway. She drives 1.85 miles south, 2.43 miles east and 0.35 miles north. Determine the magnitude of Karla's resultant displacement. explanation on answer please

**physics**

the paris gun of world war I was a super gun capable of firing a 234lb shell about 81 miles away. these shells are also the first man made objects to make it to a stratosphere. the length of the barrel of one of these guns was about 34 mETers. a projectile fired from a paris ...

**physics**

To create artificial gravity, the space station is rotating at a rate of 1.00 rpm.the radii of the cylindrically shaped chambers have a ratio ra/rb that equals 4.00. each chamber A simulates an acceleration due to gravity of 10.0m/s^2. find values for a)ra b)rb and c) the ...

**Physics**

A ninety kilogram sofa is being pushed by four meters to the other side of a hall. After an initial push the sofa is pushed with a 600 N force. In this case, 0.6 is the coefficient of kinetic friction. (The diagram shows the sofa being pushed from the right). 1) What is the ...

**physics**

Numerical of chapter 5 Fsc part 1 physics "plz answer me fast am so confused" 5.6: A 1000 kg car traveling with a speed of 144 km /h round a curve of radius 100 m. Find the necessary centripetal force?

**physics**

Determine the melting temperature when 150.00g of ice at 0 degree celdius is mixed with 300g of water at 50 degree celsius?

**Physics**

A 5.00-kg block is placed on top of a 10.0-kg block which rests on a horizontal surface. The 5.00-kg block is tied to a wall with a horizontal string. A 45.0-N horizontal force directed away from the wall is then exerted on the 10.0-kg block. The coefficient of kinetic ...

**physics**

a ball rolls off the edge of a tabletop 1m above the floor and strikes the floor at a point 1.5m horizontally from the edge of the table. Find the (a) time of flight (b) initial velocity, (c) final velocity just before it strikes the floor. Plsssss help

**physics**

latent heat of fusion of ice is 3.36exp5 j/kg and its specific heat is 1200j/mole.k.. 2kg of ice is at -10degC how much ice will be melt when a heat of 1.42exp5 joule is provided completely? a) 0.5kg b) 1.5kg c) 2kg d) 1kg

**physics grade 11**

how do i figure out how fast a car is going when all i know is frequency?

**Physics**

A body starts from rest and accelerates to 2meter per second square for 6sec.it maintains this velocity for 10sec and then decelerates to rest in 4sec.calculate the acceleration

**physics**

the speed of a certain wave is 3.00cm/s. if its frequency is 0.20hz, what are its wavelength and period

**Physics**

how long will it take a bullet fired from a cliff at an initial velocity of 700m per second at an angle of 30 Degree below the horizontal to reach the ground 200m below?answer

**physics**

Each charge of 3 micro coulomb are placed at 3 corners of a square whose diagonal is 6cm long. Find the field intensity at the point of intersection of diagonals

**Physics**

A ball mass 1000g is drop from a height Of 5m and rebounded to a height Of 25 m. Find i it kintentic just before impact ii its intial rebounce velocity and kintentic and show the working.

**Physics**

A ball is thrown toward a cliff of height h with a speed of 31 m/s and an angle of 60∘ above horizontal. It lands on the edge of the cliff 3.4 s later. What is the ball's impact speed?

**Physics**

Hello, I had a question for physics, and I tried it out, however, I got the wrong answer. The Question:If a rock takes 0.750s to hit the ground after being thrown down from a height of 4.80m, determine the rock's initial velocity. My Work : The formula- d=vi*t+1/2*a*t^2 The ...

**Physics**

A ninety kilogram sofa is being pushed by four meters to the other side of a hall. After an initial push the sofa is pushed with a 600 N force. In this case, 0.6 is the coefficient of kinetic friction. What would be the magnitude and direction of the frictional force on the ...

**Physics**

A car of mass 1530 kg traveling at 27.0 m/s is at the foot of a hill that rises 115 m in 4.40 km. At the top of the hill, the speed of the car is 6.0 m/s. Find the average power delivered by the car's engine, neglecting any frictional losses I got 8145.7 watts but that is not ...

**Physics**

When 20 kJ of heat is removed from 1.2 kg of ice originally at -15 C, what is the new temperature?

**Physics**

A woman in a car on a level road sees an airplane traveling in the same direction that is climbing at an angle of 30 degrees above the horizontal. By driving 110 km/h she is able to stay directly below the airplane. What is the airplane's velocity?

**Physics**

A 230-kg roller coaster reaches the top of the steepest hill with a speed of 5.20 km/h. It then descends the hill, which is at an angle of 25° and is 50.0 m long. What will its kinetic energy be when it reaches the bottom? Assume µk = 0.16 I'm not sure how to set up the ...

**Physics**

A record was set for stair climbing when a man ran up the 2100 steps of the Empire State Building in 15 minutes and 10 seconds. If the height gain of each step was 0.2 m, and the man's mass was 73.0 kg, what was his average power output during the climb I'm not sure which ...

**Physics**

What changed Newton's original work on the movement of the Moon around the Earth into the law of universal gravitation? 1) his conclusion that the same laws applied to all objects, no matter how small 2) his connection of gravitation to his first law 3) his connection of ...

**physics**

a block slides down a frictionless ramp. at the bottom of the ramp is a vertical circular loop with a radius of 75 cm. from what minimum height does the block need to be released in order to make it around the loop?

**physics**

a block sits on a frictionless inclined plane, attached to another block over a frictionless pulley. the angle of the incline is 20 degrees. what is the tension in the rope and the acceleration of the system? B) what is the speed of the system after the 2kg block has fallen ...

**Physics**

An 84 kg child descends a slide 7.2 m high and reaches the bottom with a speed of 3.30 m/s. How much thermal energy (in joules) due to friction was generated in this process?

**PHYSICS**

A swimmer is capable of swimming at 1.4m at still water.caculate how far downstream will it smim across 180m?