# physic

Most popular questions, page 3-
## physic

If a curve with a radius of 80m is properly banked for a car traveling 63km/h , what must be the coefficient of static friction for a car not to skid when traveling at 97km/h ?

*asked by fermona on July 6, 2013* -
## Physic

A block (mass 2.4 kg) is hanging from a massless cord that is wrapped around a pulley -3 2 (moment of inertia of the pulley = 1.3 x 10 kg·m ), as the drawing shows. Initially the pulley is prevented from rotating and the block is stationary. Then, the

*asked by Jess on February 4, 2013* -
## Physic

A 55-kg female bungee jumper fastens one end of the cord (made of elastic material) to her ankle and the other end to a bridge. Then she jumps off the bridge. As the cord is stretching, it exerts an elastic force directed up on her. Calculate her

*asked by Michelle on October 19, 2011* -
## physiC

A uniform door (0.81 m wide and 2.1 m high) weighs 150 N and is hung on two hinges that fasten the long left side of the door to a vertical wall. The hinges are 1.9 m apart. Assume that the lower hinge bears all the weight of the door. Determine the

*asked by lina on March 1, 2011* -
## physic

An air-track glider attached to a spring oscillates between the 3.00 cm mark and the 50.0 cm mark on the track. The glider completes 10.0 oscillations in 36.0 s. What is the period of the oscillations? What is the frequency of the oscillations? What is the

*asked by peggy on December 5, 2009* -
## physic

A ball is shot from the top of a building with an initial velocity of 16m/s at an angle θ = 43∘ above the horizontal. Part A What are the horizontal and vertical components of the initial velocity? If a nearby building is the same height and 55m away,

*asked by koram on October 11, 2013* -
## physic

A hockey player strikes a puck that is initially at rest. The force exerted by the stick on the puck is 950 N, and the stick is in contact with the puck for 4.4 ms (0.0044 s). (a) Find the impulse imparted by the stick to the puck. (b) What is the speed of

*asked by glenmore on December 4, 2011* -
## Physic

A 89.0 kg person stands on one leg and 90% of the weight is supported by the upper leg connecting the knee and hip joint-the femur. Assuming the femur is 0.640 m long and has a radius of 1.90 cm, by how much is the bone compressed?

*asked by Bret on May 7, 2011* -
## Physic

If 0.045 kg of ice at 0 C is added to 0.390 kg of water at 34 C in a 0.150 kg aluminum calorimeter cup, what is the final temperature of the water? Please help!

*asked by Anonymous on May 6, 2011* -
## Physic

1.What is responsible for the __ g, we experience on the surface of the Earth? 2.Why do astronauts feel weightless in space shuttles? 3. Where in the body do we sense rotation?

*asked by Soul on November 30, 2018* -
## Physic

Two cars A and B are moving along astaight road in the same direction with velocity of 25km/h and 40km/h, respectively. Find the velocity of car B relative to car A?

*asked by Nardos on November 13, 2015* -
## physic

Suzie (of mass 58 kg) is roller-blading down the sidewalk going 36 miles per hour. She notices a group of workers down the walkway who have unexpectedly blocked her path, and she makes a quick stop in 2 . 4 seconds. What is Suzie’s average acceleration?

*asked by jay on November 17, 2013* -
## physic

A Ferris wheel 26.0m in diameter rotates once every 15.0s What is the ratio of a person's apparent weight to her real weight at the top?

*asked by cuzer on July 11, 2013* -
## physic

a uniform meter stick of mass 100g is pivoted about the 30 cm mark. a mass of 200 g is placed at the 10 cm mark. where should a mass of 50 g be placed so that the meter stick balance horizontally?

*asked by visoth on April 25, 2012* -
## Physic

A 290-N sphere 0.20 m in radius rolls without slipping 6.0 m down a ramp that is inclined at 31° with the horizontal. What is the angular speed of the sphere at the bottom of the slope if it starts from rest?

*asked by Nikki on November 10, 2011* -
## physic

What hanging mass will stretch a 2.2-m-long, 0.40 - diameter steel wire by 1.1 ?

*asked by roadking on October 22, 2011* -
## physic

Two equal masses are attached to separate identical springs next to one another. One mass is pulled so its spring stretches 20 cm and the other is pulled so its spring stretches only 10 cm. The masses are released simultaneously.Which mass reaches the

*asked by leya on December 13, 2010* -
## physic

to move a large crate across a rough floor, you push down on it at an angle of 21 degree. find the force necessary to start the crate moving, given mass of the crate is 32 kg and the coefficient of static friction between the crate and the floor is 0.57

*asked by sid on November 7, 2010* -
## physic

Six roller-coaster carts pass over the same semicircular "bump." The mass M of each cart (including passenger) and the normal force n of the track on the cart at the top of each bump are given in the figures. Iam given the force in N of the cart at the

*asked by mike on October 27, 2010* -
## physic

HI!can anyone help me please, just on part b.Thank you so much. A spherical steel ball bearing has a diameter of 2.540 cm at 23°C. (a) What is the diameter when its temperature is raised to 94°C? ___ cm (b) What temperature change is required to increase

*asked by Chan on November 30, 2009* -
## physic

Hooke's law describes a certain light spring of unstretched length 30.0 cm. When one end is attached to the top of a door frame, and a 8.40-kg object is hung from the other end, the length of the spring is 40.00 cm. (a) Find its spring constant. ____ kN/m

*asked by Chan on October 21, 2009* -
## Physic

Why do protons in a very large nucleus have a greater chance of flying apart by electrical repulsion?

*asked by Will on November 13, 2007* -
## Physic

Calculate the mass of a bus if it produces o force of 14,000N while accelerating at a rate of 5 m/s^2

*asked by Sagar Chhetri on March 12, 2019* -
## physic

A hand-driven tire pump has a piston with a 2.50 cm diameter and a maximum stroke of 30 cm. how much work do you do in one stroke if the average gauge pressure is 2.40×105 N.m – 2? Select one: a. 141 J b. 4.5×107 J c. 35.3 J d. 1.41 ×108 J

*asked by lana on May 26, 2016* -
## physic

A figure skater glides along a circular path of radius 5.20 m. (a) If she coasts around one half of the circle, find the magnitude of the displacement vector. m (b) If she coasts around one half of the circle, find what distance she skated. m (c) What is

*asked by mary on February 3, 2016* -
## physic

A stationary 2.0 kg object is located on a table near the surface of the earth. The coefficient static friction between the surface is .80 and the coefficient of the kinetic friction is 0.65. A horizontal force of 5N is applied to the object. Determine the

*asked by pam on March 27, 2014* -
## physic

A charge of -2.73 μC is fixed in place. From a horizontal distance of 0.0465 m, a particle of mass 9.50 x 10-3 kg and charge -9.56 μC is fired with an initial speed of 97.2 m/s directly toward the fixed charge. What is the distance of closest approach?

*asked by derek on October 11, 2012* -
## physic

A 1500 kg car moving at 10 m/s is stopped by the action of its brakes. The work done by the car's brakes is ____ Joules.

*asked by Anonymous on July 17, 2012* -
## Physic

An electric motor rotating a workshop grinding wheel at a rate of 114 rev/min is switched off. Assume the wheel has a constant negative angular acceleration of magnitude 2.10 rad/s2. (a) How long does it take for the grinding wheel to stop?

*asked by Anthony on November 14, 2011* -
## physic

A 1.0-kg steel ball and a 2.0-m cord of negligible mass makeup a simple pendulum that can pivot without friction about thepoint O, as in the picture below. This pendulum isreleased from rest in a horizontal position, and when the ball isat its lowest point

*asked by Anonymous on February 27, 2011* -
## physic

A water skier has a mass of 73 kg. Find the magnitude of the net force acting on the skier when she lets go of the tow rope and glides to a halt in 20 s.

*asked by hy on December 4, 2010* -
## physic

The resistivity of gold is at a temperature of 20°C. A gold wire, 1.8 mm in diameter and 14 cm long, carries a current of 480 ma. The power dissipated in the wire is closest to:

*asked by paul on August 4, 2010* -
## Physic

Three uniform spheres of masses m1 = 3.50 kg, m2 = 4.00 kg, and m3 = 5.50 kg are placed at the corners of a right triangle (see figure below). Calculate the resultant gravitational force on the object of mass m2, assuming the spheres are isolated from the

*asked by Anonymous on May 25, 2017* -
## physic

A rod is 2.40 m long and has a diameter of 2.50 mm. A force of 2000 N is applied to the end to stretch the rod by 1.40 mm. What is the tensile modulus for this rod?

*asked by ngeyoo on April 16, 2016* -
## Physic

A positive charge of 4.90 μC is fixed in place. From a distance of 3.20 cm a from the fixed positive charge, a particle of mass 5.00 g and charge +3.20 μC is released from rest. What is the speed of the +3.20 μC when it is 7.50 cm away from the fixed

*asked by Julie on July 28, 2015* -
## physic

The drawing shows a device that you can make with a piece of cardboard, which can be used to measure a person's reaction time. Hold the card at the top and suddenly drop it. Ask a friend to try to catch the card between his or her thumb and index finger.

*asked by Anonymous on January 28, 2014* -
## physic

A satellite circles a spherical planet of unknown mass in a circular orbit of radius 1.9×107m . The magnitude of the gravitational force exerted on the satellite by the planet is 140N . What would be the magnitude of the gravitational force exerted on the

*asked by kerat on July 13, 2013* -
## physic

If you run a complete loop around an outdoor track(400m), in 100 second,what is your average velocity?

*asked by syida on July 12, 2011* -
## Physic

A race car makes two and a half laps around a circular track in 4.5 min. What is the car's average angular speed?

*asked by Anonymous on May 8, 2011* -
## Physic

A flywheel rotates with an angular speed of 26 rev/s. As it is brought to rest with a constant acceleration, it turns 55 rev. What is the magnitude of the angular acceleration? How much time does it take to stop?

*asked by Maria on May 8, 2011* -
## physic

Water flows through a 4.0-cm-diameler horizontal pipe ata speed uf 1.3 m/s. The pipe then narrows down to a diameter of 2.0 cm. Ignoring viscosity, what is the pressure difference between the wide and narrow sections of the pipe

*asked by john on November 19, 2009* -
## physic

Hi! Question:A ball is tossed from an upper-story window of a building.The ball is given an initial velocity of 7.80m/s at an angle of 21.0 degrees below the horizontal.It strikes the ground 3.00s later. A.How far horizontally from the base of the building

*asked by Chan on September 30, 2009* -
## physic

1. A surface charge can be produced on insulators by a. grounding b. induction c. polarization d. contact 2. Unlike insulators, conductors can be charged by a. grouding b. induction c. polarization d. contact The easy way to charge an insulator is by

*asked by Jannie on March 29, 2007* -
## Physic

A man holds a child on his shoulders while watching a football match.How much work has he done if the game last for two hours

*asked by Anonymous on February 26, 2019* -
## Physic

Two resistors when connected in series to a 120-V line use one-fourth the power that is used when they are connected in parallel. If one resistor is 4.8 kohms. what is the resistance of the other?

*asked by Allen on April 9, 2015* -
## physic

A man pushes a wooden box across the floor at a constant speed of 0.5 m/s by applying a horizontal force of 200N. Wht is the value of the force of friction on the box? Explain your answer.

*asked by sheriff on March 25, 2015* -
## Physic

A ball is thrown toward a cliff of height h with a speed of 28m/s and an angle of 60∘ above horizontal. It lands on the edge of the cliff 3.3s later. a) How high is the cliff? i got 26.7 m b) What was the maximum height of the ball? my answer here was 30

*asked by Please help me with the last question on October 22, 2014* -
## physic

A man is running at speed c (much less than the speed of light) to catch a bus already at a stop. At t=0, when he is a distance b from the door to the bus, the bus starts moving with the positive acceleration a. Use a coordinate system with x=0 at the door

*asked by metu on October 4, 2012* -
## physic

An 85.0-N backpack is hung from the middle of an aluminum wire, The degree of hung of the wire is 3 degree. The temperature of the wire then drops by 20.0 C¡ã. Find the tension in the wire at the lower temperature. Assume that the distance between the

*asked by firous on March 31, 2010* -
## physic

please help me.A 5.00 g object moving to the right at +20.0 cm/s makes an elastic head-on collision with a 10.0 g object that is initially at rest. (a) Find the velocity of each object after the collision. 5.00 g object 10.0 g objectt (b) Find the

*asked by Chan on October 28, 2009* -
## Physic

A space station that does not rotate cannot simulate gravity for its occupants. A)True B)False From within a rotating reference frame, the centrifugal force simulates gravity. A)True B)False On a rotating station, a person at the center of the station, in

*asked by Q on November 30, 2018* -
## Physic

A blue ball is thrown upward with an initial speed of 21.0 m/s, from a height of 0.8 meters above the ground. 2.6 seconds after the blue ball is thrown, a red ball is thrown down with an initial speed of 8.3 m/s from a height of 24.6 meters above the

*asked by First name on February 11, 2018* -
## physic

A particle with mass m = 3.80 kg accelerates according to a = (−2.60i + 1.70j) m/s2. (a) What is the net force acting on the particle? (Express your answer in vector form.) F = N (b) What is the magnitude of this force? N

*asked by joy on February 5, 2018* -
## Physic

you have to push with a force of 200N to slide a refrigerator across a floor at constant velocity.What is the force of friction acting on the fridge?

*asked by nicholas on December 7, 2016* -
## physic

A motorcycle racer traveling at 145 km/h loses control in a corner of the track and slides across the concrete surface. The combined mass of the rider and bike is 243 kg. The steel of the motorcycle rubs against the concrete road surface. (a) What is the

*asked by hassan yousif on July 16, 2016* -
## Physic

You see a bolt of lightning and hear thunder two seconds later. The speed of sound is about 343 m/s. Estimate?

*asked by Mary on October 25, 2015* -
## Physic

A 60-g bullet fired at two blocks resting on a surface with coefficient of kinetic friction =0.5. The bullet pass through a 8-kg block and make this block slides 0.8 m. And then the bullet lodges in another block which is 6 kg. The bullet make it slides

*asked by Takako on March 3, 2015* -
## Physic

A grenade that is falling vertically explodes into two equal fragments when it is at a height of 2000 m and has a downward velocity of 60 m/s. Immediately after the explosion one of the fragments is moving downward at 80 m/s. Find the position of the

*asked by kevin on December 11, 2014* -
## physic

A pig slides down a 29° incline in twice the time it would take to slide down a frictionless 29° incline. What is the coefficient of kinetic friction between the pig and the incline?

*asked by Dina on October 26, 2014* -
## physic

How much energy is required to change a 40 g ice cube from ice at -25°C to steam at 105°C?

*asked by Renee on April 6, 2014* -
## physic

11. What is the acceleration of a 4000 kg airplane that has a force on it of 24,000 N

*asked by alisa on October 30, 2012* -
## physic

a bullet is fired from the ground at the angle of 30 degree above the horizontal,What initial speed must the bullet have in order to hit a point 250 ft high on a tower located 400 ft away (ignoring air resistance),what the solution?

*asked by aisya on April 11, 2012* -
## physic

A student on a piano stool rotates freely with an angular speed of 3.07 rev/s. The student holds a 1.38 kg mass in each outstretched arm, 0.759 m from the axis of rotation. The combined moment of inertia of the student and the stool, ignoring the two

*asked by Mary on March 25, 2010* -
## physic

Hi!Two forces are applied to a car in an effort to move it, as shown in the following figure, where F1 = 439 N(10degree) and F2 = 365 N(30degree). (Assume up and to the right as positive directions.) (a) What is the resultant of these two forces?

*asked by Chan on October 12, 2009* -
## physic

The Moon orbits Earth in a nearly circular orbit that lasts 27.32 days. Determine the distance from the surface of the Moon to the surface of Earth.

*asked by joy on February 24, 2018* -
## physic

A jetliner travels with a constant speed of 597.4 km/h relative to the air to a city 780.1 km due south. (a) What is the time interval required to complete the trip if the jetliner is experiencing a headwind of 41.1 km/h toward the north? h (b) What is the

*asked by joy on January 31, 2018* -
## physic

A wheel on a moving car slows uniformly from 420 rpm to 120 rpm in 4 sec. A. What is the angular acceleration of the wheel? B. What is the angular displacement? How many revolutions? C. How far does the car travel if the radius of the wheel is 0.20cm?

*asked by piggy on February 5, 2015* -
## Physic

A father pushes horizontally on his daughter's sled to move it up a snowy incline, as illustrated in the figure, with h = 3.7 m and θ = 18°. The total mass of the sled and the girl is 35 kg and the coefficient of kinetic friction between the sled runners

*asked by Thanh on November 18, 2012* -
## physic

3 charges sit on vertical equilateral triangle the side of each is 30.0 cm. if the triangle are A= +4.0 uC B=+5.0 uC and C=+6.0 uC (clockwise from top) what is the force on each charge?

*asked by sara on August 17, 2012* -
## Physic

A ball is projected vertically up word from the top of tower 60m ,hight with velocity 30m ,what is the mex heigh above the ground leve? How long it take to reach the ground

*asked by Anonymous on March 8, 2012* -
## physic

A person stands on a bathroom scale in a motionless elevator begins to move,the scale briefly reads only 0.75 of th person regular weight(means Fn=0.75mg).Calculate the acceleration of the elevator,and find the direction of acceleration.

*asked by noah on July 10, 2011* -
## physic

How much current will be flowing through a 57.0m length of copper wire with radius 5.7mm if it is connected to a source supplying 620V. (The resistivity of copper is 1.68x10^-8ohm's.m

*asked by kris on August 4, 2010* -
## Physic

an someone please help me out on this... An ideal transformer has 50 turns in its primary and 250 turns in its secondary. 12 V ac is connected to the primary. Find: 1. The volts ac available at the secondary 2. Current in the 10 device connected to t

*asked by Ollie on November 2, 2007* -
## Physic

A ball B1 is dropped from the top of a building, one second later another ball, B2 is thrown down with an initial speed of 20.0m/s. The two balls hit the ground at the same time. 1)What is the time it took B1 to teach the ground? 2) What is the height of

*asked by Heeelllp on March 24, 2017* -
## Physic

John carries a 200 N suitcase up three flights of stairs (a height of 10 m) and then pushes it with a horizontal force of 50 N at a constant speed of 0.5 m/s for a horizontal distance of 35 meters. How much work does Ben do on his suitcase during this

*asked by Help me on April 6, 2016* -
## physic

A ball is tossed from an upper-story window of a building. The ball is given an initial velocity of 8.50 m/s at an angle of 15.0° below the horizontal. It strikes the ground 3.00 s later. (a) How far horizontally from the base of the building does the

*asked by mark on February 3, 2016* -
## Physic

A person pulls a toboggan for a distance of 43.1 m along the snow with a rope directed 33.3 ° above the snow. The tension in the rope is 109 N. (a) How much work is done on the toboggan by the tension force? (b) How much work is done if the same tension

*asked by Lena on March 5, 2015* -
## Physic

An electron is released from rest in a uniform electric field and accelerates to the north at a rate of 115 m/s^2.Determine the magnitude and direction of electric field.

*asked by Syam on December 16, 2014* -
## Physic

The figure below shows a block of mass m resting on a 20¡ã slope. The block has coefficients of friction ¦Ìs = 0.73 and ¦Ìk = 0.53 with the surface. It is connected via a massless string over a massless, frictionless pulley to a hanging block of mass

*asked by Jason on March 3, 2014* -
## physic

A Ferris wheel 26.0m in diameter rotates once every 15.0s What is the ratio of a person's apparent weight to her real weight at the top?

*asked by cuzer on July 12, 2013* -
## physic

a negative charge of -0.55 uc an unknown charge 0.300 m diectly below it. what are the magnitude an direction of the force that unknown charge exerts on the -0.550 uc charge ?

*asked by yanis on February 12, 2013* -
## PHYSIC

What current is required in the winding of a long solenoid that has 1000 turns uniformly distributed over a length of 0.4 m, to produce at the center of the solenoid a magnetic field of magnitude 1.0 x 10 -4 T?

*asked by KAIT on September 3, 2011* -
## physic

The drawing (not to scale) shows one alignment of the sun, earth, and moon. The gravitational force SM that the sun exerts on the moon is perpendicular to the force EM that the earth exerts on the moon. The masses are: mass of sun = 1.99 1030 kg, mass of

*asked by hy on November 21, 2010* -
## physic

A 4 kg object is attached to a vertical rod by two strings, as in the figure. The object rotates in a horizontal circle at constant speed 6 m/s. Find the tension in (a) the upper string and (b) the lower string.

*asked by yusra on April 18, 2010* -
## physic

Hi! could you help this problem please try so many time but, the answer is not correct. Question:The tires on a new compact car have a diameter of 2.0 ft and are warranted for 62,000 miles. (a) Determine the angle (in radians) through which one of these

*asked by Chan on November 15, 2009* -
## Physic

1. A bicyclist and a parked car have a head-on collision. Compare the relative motions on each. 2. Why isn't the Earth pulled into orbit around a communication satellite?

*asked by Anonymous on October 29, 2018* -
## physic

A 2000 N sled is pulled along a horizontal surface with a constant force by means of a rope that makes an angle of 30.0o with the horizontal. If the tension in the rope is 500 N and there is 100 N of frictional force between the sled and the surface, find

*asked by sk on May 8, 2016* -
## Physic

A winch drags a 200 kg crate along a 15 degrees incline at 0.2 m/s. The coefficient of kinetic friction is 0.22. What is the power required as the crate moves up the slope?

*asked by Naniso on November 5, 2015* -
## Physic

A crate of mass 20kg was moved up a rough plane inclined at 30degree to the ground. If the crate was moved a distance of 5m after 10mins. Determine the total rate at work done.

*asked by Hafsat Abdulmalik on May 17, 2015* -
## physic

A 1250 kg wrecking ball is lifted to a height of 12.7 m above its resting point. When the wrecking ball is released, it swings toward an abandoned building and makes an indentation of 43.7 cm in the wall. a. What is the potential energy of the wrecking

*asked by wellington on December 18, 2014* -
## physic

a car travels east at 89 km/h for 1 hour.it then travels 26 east of north at 141 km/h for another 1 hour. a)what is the average speed for the trip? b)what is the average velocity for the trip?

*asked by siti on September 8, 2014* -
## physic

A dielectric-filled parallel-plate capacitor has plate area A = 10.0cm2 , plate separation d = 7.00mm and dielectric constant k = 3.00. The capacitor is connected to a battery that creates a constant voltage V = 7.50V . Throughout the problem, use ϵ0 =

*asked by asasa on April 27, 2014* -
## Physic

A boy of mass 50kg runs up a set of stress of total height 3.0m. Find the work done against gravity

*asked by Commerade on February 3, 2014* -
## physic

a 2500 car enters curve with a radius of 45 m .if the car is moving at speed of 35 m/s.what is the centripetal force that maintains the car s circular motion the curve ?

*asked by said on March 4, 2013* -
## physic

A grinding wheel of radius 0.280 m rotating on a frictionless axle is brought to rest by applying a constant friction force tangential to its rim. The constant torque produced by this force is 75.3 N · m. Find the magnitude of the friction force.

*asked by Anonymous on July 29, 2012* -
## physic

Before practicing his routine on the rings, a 67 kg gymnast hangs motionless, with one hand grasping each ring and his feet touching the grounnd. Both arms make an angle of 24 degrees with the vertical.(a) If the force exerted by the rings on each arm has

*asked by taylor on November 6, 2011* -
## physic

The amount of heat released when 100 grams of steam at 100 degrees Celsius is converted into liquid water at 100 degrees Celsius is ____ J.

*asked by bode on March 26, 2011* -
## physic

An object attached to the end of a string swings in a vertical circle (R = 1.2 m), as shown. At an instant when ƒá = 30„a, the speed of the object is 5.1 m/s and the tension in the string has a magnitude of 20 N. What is the mass of the object?

*asked by yusra on April 18, 2010* -
## physic

A police officer arrives at the scene of the collision of the two snowmobiles (Figure 1) to find both drivers unconscious. When the two vehicles collided, their skis became entangled and the two snowmobiles remained locked together as they skidded to a

*asked by sam on April 2, 2007* -
## Physic

What is the power of an engine that pulls a automobile at asteady speed of 10m/s along a level road

*asked by Mahesh kumar on January 23, 2019*