Wednesday

March 4, 2015

March 4, 2015

**Recent Homework Questions About Physics**

Post a New Question | Current Questions

**Physics**

Particles of charge +65, +48, and −95 μC are placed in a line. The center one is L = 60cm from each of the others.Calculate the net force on the left charge due to the other two.
*Saturday, January 31, 2015 at 11:55pm*

**Physics**

In the picture to the right, a ring pulls a box of mass m = 5.0 kg across a level table. The string pulls with a tension F = 25.0 N at an angle θ = 25˚ above the horizontal. A frictional force of 4.0 N also acts on the box. Calculate a. the normal force on the box. b...
*Saturday, January 31, 2015 at 11:10pm*

**Physics**

A bird sits at rest in the middle of a wire. The wire slopes upward at 5* from the horizontal on either side of the bird. If the wire on both sides of the bird is experiencing a tension force of 106 N, then what is the mass of the bird?
*Saturday, January 31, 2015 at 10:43pm*

**physics**

An athlete performing a long jump leaves the ground at a 27.1∘ angle and lands 7.72m away 1.What was the takeoff speed? 2.If this speed were increased by just 5.0%, how much longer would the jump be?
*Saturday, January 31, 2015 at 9:47pm*

**physics II**

A rocket is launched vertically from ground with a constant acceleration. If the rocket emits a burst of sound every five seconds after launching, find the difference of intensity levels observed at the launching site for the first and the second bursts of sound.
*Saturday, January 31, 2015 at 6:02pm*

**Physics II**

Please can anyone explain. Thank you. A rocket is launched vertically from ground with a constant acceleration. If the rocket emits a burst of sound every five seconds after launching, find the difference of intensity levels observed at the launching site for the first and the...
*Saturday, January 31, 2015 at 3:30pm*

**Physics**

the charge on a pith ball was measured as +40 nC. if the charge on an electron is -1.6 x 10^-19, how many electrons have been added or removed from the ball?
*Saturday, January 31, 2015 at 2:19pm*

**Physics**

The space shuttle is in a 3e+5 m high orbit over the earth. The radius of the earth is 6.37e+6 m, the mass of the earth is 5.98e+24 kg. What is the distance from the center of the earth to the space shuttle? I don't know whether I would double the radius and the add the ...
*Saturday, January 31, 2015 at 11:09am*

**Pure math,Life science,Geography and History**

Hi I'm grade10 and I was wondering if you's could help Me to get a career examples after matric because my school took away our Physics for unknown reasons so insted of Physics or another subject that would help you in the future they gave us History please help me ...
*Saturday, January 31, 2015 at 6:54am*

**physics**

Three point charge are located at a line 20cm with charge q1= -3uC, q2= +4uC, q3= -7uC. Determine the magnitude of the force.
*Saturday, January 31, 2015 at 5:46am*

**Physics**

Three people pull simultaneously on a stubborn donkey. Jack pulls eastward with a force of 68.5 N, Jill pulls with 61.3 N in the northeast direction, and Jane pulls to the southeast with 111 N. (Since the donkey is involved with such uncoordinated people, who can blame it for ...
*Saturday, January 31, 2015 at 2:03am*

**Physics**

Ali and hid father sit at the ends of a see-saw, 2 m from the pivot, as shown in figure 5.12. Where should ali's mother sit in order to balance the see-saw?
*Friday, January 30, 2015 at 11:26pm*

**Physics**

Two point charges Q1=-6.80nC and Q2 = -5.80nC are separated by 33.0cm. What is potential energy of the pair? Answer in units of Joules.
*Friday, January 30, 2015 at 11:26pm*

**Physics**

Ali and his father sit at the ends of a see-saw, 2 m from the pivot, as shown in figure 5.12. Where should ali's mother sit in order to balance the see-saw?
*Friday, January 30, 2015 at 11:25pm*

**Physics**

An object in space is initially stationary relative to the Earth. Then, a force begins acting on the object, starting with a force of 0 N, and increasing at a uniform rate until the magnitude of the force is 56 N after the force has acted for 10 s. The body has a mass of 15 kg...
*Friday, January 30, 2015 at 5:51pm*

**Physics**

A cheetah is hunting. Its prey runs for 2.88 s at a constant velocity of +8.93 m/s. Starting from rest, what constant acceleration must the cheetah maintain in order to run the same distance as its prey runs in the same time? (Give the magnitude of the acceleration
*Friday, January 30, 2015 at 5:30pm*

**Physics**

A Boeing 747 "Jumbo Jet" has a length of 55.9 m. The runway on which the plane lands intersects another runway. The width of the intersection is 24.0 m. The plane decelerates through the intersection at a rate of 5.61 m/s2 and clears it with a final speed of 43.3 m/s...
*Friday, January 30, 2015 at 5:30pm*

**Physics**

A bullet is fired through a wooden board with a thickness of 12.0 cm. The bullet hits the board perpendicular to it, and with a speed of +370 m/s. The bullet then emerges on the other side of the board with a speed of +333 m/s. Assuming constant acceleration (rather, ...
*Friday, January 30, 2015 at 5:28pm*

**physics**

A ball is dropped from an upper floor, some unknown distance above your apartment. As you look out of your window, which is 1.5 m tall, you observe that it takes the ball 0.18 seconds to traverse the length of the window. Determine how high above the top of your window the ...
*Friday, January 30, 2015 at 4:21pm*

**physics**

a) Determine the capacitance, in pF, of a paper-filled parallel-plate capacitor (dielectric constant=3.70) having a plate area of 5.40cm2 and plate separation of 590 µm. Use 8.85 x 10-12 F/m for εo, the permittivity of free space. For this I got 2998.53x10-2 b) ...
*Friday, January 30, 2015 at 2:27pm*

**physics**

Determine the capacitance, in pF, of a paper-filled parallel-plate capacitor (dielectric constant=3.70) having a plate area of 5.40cm2 and plate separation of 590 µm. Use 8.85 x 10-12 F/m for εo, the permittivity of free space
*Friday, January 30, 2015 at 1:46pm*

**physics**

A capacitor is rolled from two strips of aluminum separated by two strips of paraffin-coated paper. Each strip is 5.40cm wide. The foil is 7.00μm thick, and the paper is 50.0μm thick. What length, in cm, should the strips be if a capacitance of 24.0nF is desired? Use...
*Friday, January 30, 2015 at 1:38pm*

**physics**

A jet plane lands in an airport with a speed of 125 m/s and can accelerate uniformly at a maximum rate of -9.8 m/s2 as it comes to rest. What should be the minimum length of the runway so that the jet plane can land in the airport safely?
*Friday, January 30, 2015 at 10:04am*

**physics**

A bowling ball with a mass of 4.5 kg travels at a velocity of 37 m/s for 2.5 s until it is stopped at the end of the lane by the ball return. What additional information is required to determine the weight of the bowling ball? A. the amount of friction from the bowling lane ...
*Friday, January 30, 2015 at 9:11am*

**Physics**

A 1800 kg mass car is traveling south at a velocity of 15 m/s through an intersection. It is hit by a 3500 kg mass car traveling east at 20 m/s. If the two cars collide and become one object (perfectly inelastic). What will be the final displacement of the cars after the ...
*Friday, January 30, 2015 at 9:03am*

**Physics**

A 5 gram bullet is fired into a 7 kg ballistic pendulum suspended vertically from the ceiling. If the bullet embeds into the block and the two move as one to a new final height of 12 cm. What was the initial velocity of the bullet before impacting the pendulum?
*Friday, January 30, 2015 at 9:00am*

**Physics **

In raising the steel mass 6.0m, the electric motor uses more energy than that calculated in (a)(i). Write down and explain two causes of this higher energy requirement.
*Friday, January 30, 2015 at 6:21am*

**Physics**

A 50 kg satellite circles the earth in an orbit with a period of 110 min. What minimum energy E is required to change the orbit to one with a period of 320 min? Assume both the initial and final orbits are circular. The Earth’s radius is 6.37 × 10^6 m, its mass is 5...
*Friday, January 30, 2015 at 4:38am*

**physics**

The equation of a SHM of a 600 g object is given as x = 0.45 cos 6.4 t where the displacement x is in meters and time in seconds. What is the total energy of the system?
*Friday, January 30, 2015 at 4:28am*

**Science:Physics**

Nilo drives is van with an average velocity of 45.0 km/h along the North Expressway. How long will it take him to drive 350 km on a perfectly straight highway
*Friday, January 30, 2015 at 1:45am*

**physics**

At the instant the traffic light turns green, an automobile that has been waiting at an intersection starts ahead with a constant acceleration of 2.10m/s2 . At the same instant, a truck, traveling with a constant speed of 15.1m/s , overtakes and passes the automobile. How far ...
*Thursday, January 29, 2015 at 10:39pm*

**Physics**

A hollow metal sphere has inner and outer radii of 20.0 cm and 30.0 cm, respectively. As shown in the figure, a solid metal sphere of radius 10.0 cm is located at the center of the hollow sphere. The electric field at a point P, a distance of 15.0 cm from the center, is found ...
*Thursday, January 29, 2015 at 10:33pm*

**physics**

A juggler tosses a ball h = 2 m into the air with one hand and catches it with the other hand at the same level. Neglecting air resistance, how long is the ball in the air?
*Thursday, January 29, 2015 at 10:22pm*

**physics**

A +1.4-nC point charge is placed at one corner of a square (1.8 m on a side), and a -2.5-nC charge is placed on the corner diagonally opposite. What is the magnitude of the electric field at either of the other two corners?
*Thursday, January 29, 2015 at 10:16pm*

**physics**

Two point charges are placed at two of the corners of a triangle (Take q1 = -10.2 µC, and q2 = 16.3 µC.) Find the magnitude and the direction of the electric field at the third corner of the triangle.
*Thursday, January 29, 2015 at 10:16pm*

**physics**

An owl is carrying a mouse to the chicks in its nest. Its position at that time is 4.00 m west and 12.0 m above the center of the 30.0 cm diameter nest. The owl is flying east at 3.50 m/s at an angle 30.0º below the horizontal when it accidentally drops the mouse. Is the ...
*Thursday, January 29, 2015 at 10:04pm*

**physics**

A skier of mass 74.6 kg is pulled up a slope by a motor-driven cable. How much work is required to pull the skier 63.3 m up a 39.0◦ slope (assumed to be frictionless) at a constant speed of 2.0 m/s? The acceleration of gravity is 9.81 m/s 2 . Answer in units of J
*Thursday, January 29, 2015 at 8:59pm*

**physics**

Each vertical steel column of an office building supports a weight of 1.30 x 10^5 N and is compressed to 5.90 x 10^-3 A) Find the compression in each column if a wegith of 5.50 x 10^5 N is supported. B)If the compression of each steel column is 0.0710 cm, what wight is ...
*Thursday, January 29, 2015 at 8:41pm*

**Physics 201**

A person desires to reach a point that is 2.87 km from her present location and in a direction that is 47.5° north of east. However, she must travel along streets that are oriented either north-south or east-west. What is the minimum distance she could travel to reach her ...
*Thursday, January 29, 2015 at 7:53pm*

**URGENT PHYSICS**

Consider a case in which a 60 kg diver takes off from a diving board located at a height of 10 m above the water level and enters the water at a horizontal distance of 5 m from the end of the board. If the total time that the diver remains in the air is 2.5 seconds, determine ...
*Thursday, January 29, 2015 at 7:31pm*

**physics**

boy throws a penny into an empty well with an initial velocity of –2 m/s. He hears it hit the bottom 8 seconds later. About how far did the penny fall?
*Thursday, January 29, 2015 at 6:45pm*

**Physics**

A lobsterman’s buoy is a solid wooden cylinder of radius r and mass M. It is weighted at one end so that it floats upright in calm sea water, having density. A passing shark tugs on the slack rope mooring the buoy to a lobster trap, pulling the buoy down a distance x from...
*Thursday, January 29, 2015 at 6:43pm*

**physics**

An electron moving parallel to x axis has an initial speed of 2.51x106 m/s at the origin.Its speed is reduced to 1.76x105 m/s at the point x=3.12 cm. Calculate the potential difference, in Volts, between the origin and that point.
*Thursday, January 29, 2015 at 6:43pm*

**Physics**

This deals with Projectile Motion and I would be glad if someone were to check if my answers are correct. 1. c 2. b 3. a 4. d If air resistance were to be ignored, 1.a projectile that has a horizontal velocity is a)zero b)constant c)increasing d)decreasing 2.a projectile that ...
*Thursday, January 29, 2015 at 6:42pm*

**physics**

What potential difference is needed to stop an electron having an initial speed of 3.70x 105 m/s? Answer in volts
*Thursday, January 29, 2015 at 6:32pm*

**Physics**

Suppose you have a 3 C charge at (1,0) m and a -3 C charge at (-1,0) m. Find (a) the electric field at the point (0,3), and (b) the electric force on a charge of 3 nC placed at (0,3).
*Thursday, January 29, 2015 at 5:48pm*

**Physics**

A man in search of his dog drives first 13.3 mi northeast, then 17.3 mi straight south, and finally 6.85 mi in a direction 30.3° north of west. a) What is the magnitude of his resultant displacement? b) What is the direction of his resultant displacement? Express your ...
*Thursday, January 29, 2015 at 5:21pm*

**Physics**

A 50 cm diameter wheel rotates through 25 radians. How do I figure out the amount of distance it will move?
*Thursday, January 29, 2015 at 5:13pm*

**Need Help Physics**

The captain of a boat wants to travel directly across a river that flows due east with a speed of 1.09 m/s. He starts from the south bank of the river and wants to reach the north bank by travelling straight across the river. The boat has a speed of 6.44 m/s with respect to ...
*Thursday, January 29, 2015 at 5:12pm*

**Physics Help**

During a long airport layover, a physicist father and his 8-year-old daughter try a game that involves a moving walkway. They have measured the walkway to be 41.5 m long. The father has a stopwatch and times his daughter. First, the daughter walks with a constant speed in the ...
*Thursday, January 29, 2015 at 5:09pm*

**physics **

A ball of mass M1 moves with a velocity U1, collides perfectly elastically with a stationary ball of mass M2 . After the collision, M1 and M2 move with velocities V1 and V2 respectively. Show that : V1 =(M1-M2) / (M1 + M2 ) * U1 .
*Thursday, January 29, 2015 at 5:02pm*

**Physics**

By trial and error, a frog learns that it can leap a maximum horizontal distance of 1.26 m. If, in the course of an hour, the frog spends 27.5 % of the time resting and 72.5 % of the time performing identical jumps of that maximum length, in a straight line, what is the ...
*Thursday, January 29, 2015 at 5:01pm*

**physics**

CRITICAL THINKING: The term ”weight” in physics has the following very specific meaning: “The weight of an object is the name given to a particular force: the gravitational force exerted by the earth on the object, giving it an acceleration of 9.8 m/s2 near the ...
*Thursday, January 29, 2015 at 4:53pm*

**physics**

CRITICAL THINKING: The term ”weight” in physics has the following very specific meaning: “The weight of an object is the name given to a particular force: the gravitational force exerted by the earth on the object, giving it an acceleration of 9.8 m/s2 near the ...
*Thursday, January 29, 2015 at 4:53pm*

**physics**

Two forces of equal magnitude act on the same object. Which of the following must be true? a. The object is moving. b. The object is accelerating. c. If the object is initially at rest, it cannot remain at rest. d. The two forces form a third-law pair. e. None of the above.
*Thursday, January 29, 2015 at 4:52pm*

**physics**

Suppose a car is traveling at +25.0 m/s, and the driver sees a traffic light turn red. After 0.564 s has elapsed (the reaction time), the driver applies the brakes, and the car decelerates at 4.00 m/s2. What is the stopping distance of the car, as measured from the point where...
*Thursday, January 29, 2015 at 4:21pm*

**Physics**

Mark launches a projectile 65 degrees from the horizontal and it strikes the ground a certain distance away. For what other angle of launch at the same speed would the projectile land just as far away?
*Thursday, January 29, 2015 at 3:45pm*

**physics **

Consider a case in which a 60 kg diver takes off from a diving board located at a height of 10 m above the water level and enters the water at a horizontal distance of 5 m from the end of the board. If the total time that the diver remains in the air is 2.5 seconds, determine ...
*Thursday, January 29, 2015 at 3:01pm*

**Physics**

A spring of negligible mass stretches 3.00 cm from its relaxed length when a force of 7.10 N is applied. A 0.440-kg particle rests on a frictionless horizontal surface and is attached to the free end of the spring. The particle is displaced from the origin to x = 5.00 cm and ...
*Thursday, January 29, 2015 at 2:36pm*

**physics**

A baseball is hit and moves initially at an angle of 35.0 to the horizontal ground with a velocity of 25.0 m/s. (a) What are the vertical and horizontal components of the initial velocity? (b) How long will the ball be in the air? (c) What is the range?
*Thursday, January 29, 2015 at 2:27pm*

**physics**

You fire a cannon ball from ground level at a speed of 20.0 m/s ∠30.0 Find the time taken for the ball to hit the earth. How far will it land?
*Thursday, January 29, 2015 at 2:26pm*

**physics**

A ball rolls off a 1.40 m high table with an initial horizontal speed of 0.600 m/s. How far will it land?
*Thursday, January 29, 2015 at 2:23pm*

**physics**

Using the following number: 26,802 In 4 significant figures, this number would be Answer. In 3 significant figures, this number would be Answer. In 2 significant figures, this number would be Answer. In 1 significant figure, this number would b
*Thursday, January 29, 2015 at 1:55pm*

**physics**

A particular jet aircraft must reach a speed of 43 m/s in order to take-off. If the acceleration of the plane is 1329 m/s2, the minimum length of the runway is Answermeters
*Thursday, January 29, 2015 at 1:52pm*

**physics**

An aircraft has a lift off speed of 130 km/h. What minimum uniform acceleration does this require if the aircraft is to be airborne after a takeoff run of 350 m? Answer in units of m/s2
*Thursday, January 29, 2015 at 12:22pm*

**physics**

With an average acceleration of −1.3 m/s2 , how long will it take a cyclist to bring a bicycle with an initial speed of 13.7 m/s to a complete stop? Answer in units of s.
*Thursday, January 29, 2015 at 12:18pm*

**physics**

Heather and Matthew walk eastward with a speed of 0.90 m/s east. If it takes them 31 min to walk to the store, how far have they walked? Answer in units of km.
*Thursday, January 29, 2015 at 12:18pm*

**physics**

A speeder passes a parked police car at a constant speed of 20.1 m/s. At that instant, the police car starts from rest with a uniform acceleration of 2.65 m/s 2 . How much time passes before the speeder is overtaken by the police car? Answer in units of s.
*Thursday, January 29, 2015 at 12:16pm*

**physics**

A dragster is speeding down the track at 150m/s. its rear wheels are 2m in diameter, and its front wheels are 40cm in diameter. What are the angular velocities of the front and rear wheels, respectively?
*Thursday, January 29, 2015 at 11:34am*

**physics**

A block and tackle with a velocity of 5 is used to raise a mass of 25kg through a vertical distance of 40cm at a steady rate,if the effort is equal to 60N,determine the distance moved by effort, work done by the effort in lifting the load and the loss of energy involved in ...
*Thursday, January 29, 2015 at 11:06am*

**Physics**

an aircraft lands on a runway with length of 205 m at a speed of 295 km/h what is the minimum constant deceleration required for a safe landing
*Wednesday, January 28, 2015 at 11:58pm*

**physics**

A projectile is fired at 33.1° above the horizontal. Any effects due to air resistance are negligible. At the highest point in its trajectory, its speed is 15.5 m/s. Calculate the horizontal component of the initial velocity.
*Wednesday, January 28, 2015 at 11:48pm*

**Physics**

In the annual battle of the dorms, students gather on the roofs of Jackson and Walton dorms to launch water balloons at each other with slingshots. The horizontal distance between the buildings is 36.0 m, and the heights of the Jackson and Walton buildings are, respectively, ...
*Wednesday, January 28, 2015 at 11:31pm*

**PHYSICS**

a copper cylinder is initially at 20.0 degree Celsius. At what temperature will its volume be 0.150% larger than it is at 20.0 degree Celsius?
*Wednesday, January 28, 2015 at 10:28pm*

**physics**

What is the mass of 5.00L of pure water?
*Wednesday, January 28, 2015 at 10:24pm*

**physics**

What would be the charge on five alpha particles?(An alpha particle is helium nucleus) I started with 2 from the helium multiply by 5 and got 10. I don't know what to do next. Please help???
*Wednesday, January 28, 2015 at 9:55pm*

**Physics **

A spring with an unstrained length of 0.075 m and a spring constant of 2.7 N/m hangs vertically downward from the ceiling. A uniform electric field directed vertically upward fills the region containing the spring. A sphere with a mass of 4.84 10-3 kg and a net charge of +7.0...
*Wednesday, January 28, 2015 at 8:56pm*

**Physics**

A compact car, with mass 725kg, is moving at 115km/h toward the east.....find the magnitude and direction of it's momentum. Draw an arrow on your sketch showing the momentum
*Wednesday, January 28, 2015 at 7:11pm*

**physics**

A swimmer can swim 3 mph in still water. She decides to swim perpendicular to the river current which is 3 mph. If the river is 19.89 miles wide, it will take the swimmer ___ hours to cross the river.
*Wednesday, January 28, 2015 at 6:22pm*

**physics**

A swimmer can swim 1.7 mph in still water. She decides to swim upsteam against the current which is 0.7 mph. It will take the swimmer ___ hours to travel 8 miles as measured by a person standing on the river bank.
*Wednesday, January 28, 2015 at 6:19pm*

**physics**

A 4.3kg object moves across a floor with a velocity of + 8.2 m/s and slides to rest in 5.8 s. The net force producing this acceleration is:
*Wednesday, January 28, 2015 at 6:17pm*

**physics **

A typical multivitamin tablet can contain 2.00mg of vitamin B2 (riboflavin), and the RDA is 0.0030 g/day. How many such tablets should a person take each day to get the proper amount of this vitamin, assuming that he gets none from any other sources?
*Wednesday, January 28, 2015 at 5:13pm*

**Physics**

As mentioned, after the hovering period at 100 m , the vehicle made a vertical powered descent to h = 30 m, ending with a downward (!) velocity of 2 m/s at this altitude. Assume that the engine provided a constant (!) thrust-to-weight ratio during this phase and that the ...
*Wednesday, January 28, 2015 at 4:55pm*

**Physics **

Well, I just found out that I failed my physics midterm. I got a 51. Yes I studied but I still don't get the forces and inclined planes. And my parents are going to kill me if they find out. The midterm brought down my grade to a 79!! Any advice? P.S I also got a 71 on my ...
*Wednesday, January 28, 2015 at 3:27pm*

**Physics**

A 7.1 kg watermelon is placed at one end of a 5.9 m, 244 N scaﬀolding supported by two cables. One supporting cable is at the opposite end of the scaﬀolding, and the other is 0.54 m from the watermelon. How much tension is in the cable at the end of the sca&#...
*Wednesday, January 28, 2015 at 2:53pm*

**Physics**

An airplane cruises at 880km/h relative to the air. It is flying from Denver, Colorado due west to Reno, Neveda, a distance of 1200km and will then return. There is a steady 90km/h wind blowing to the east. What is the difference in flight time between the two legs of the trip?
*Wednesday, January 28, 2015 at 2:36pm*

**physics**

The three charges in the figure are at the vertices of an isosceles triangle. Calculate the work that needs to be expanded, in Joules, to bring the charges together (as shown.) Take q=5.7 μC. The length of base is b=2.30 m. The lengths of sides are s=5.80 m. The two ...
*Wednesday, January 28, 2015 at 2:09pm*

**physics**

Assuming that the human body has a 1.2-cm-thick layer of skin tissue and a surface area of 1.5m2 , estimate the rate at which heat is conducted from inside the body to the surface if the skin temperature is 34 ∘C. (Assume a normal body temperature of 37 ∘C for the ...
*Wednesday, January 28, 2015 at 12:53pm*

**physics**

The U.S. five-cent coin, the nickel, has a mass of 5.1 g, a volume of 0.719 cm3, and a total surface area of 8.54 cm2. Assuming that a nickel is an ideal radiator, how much radiant energy per second comes from the nickel, if it is at 24∘C?
*Wednesday, January 28, 2015 at 12:53pm*

**physics**

Assume a goose has a 2.2-cm-thick layer of feather down (on average) and a body surface area of 0.16m2 .What is the rate of heat loss (conduction only) if the goose, with a body temperature of 41 ∘C, is outside on a winter day when the air temperature is 12∘C?
*Wednesday, January 28, 2015 at 12:52pm*

**physics**

If 0.060kg of ice at 0 ∘C is added to 0.320kg of water at 25∘C in a 0.150-kg aluminum calorimeter cup, what is the final temperature of the water?
*Wednesday, January 28, 2015 at 12:51pm*

**physics**

a spring balance is tied to a massless inextenxible string a small object of mass 60kg is attached to the hook of the spring balance. this system is now whirled about a vertical axis so that object performs ucm with centripetal acceleration/21m/s^2.thespring balance will now ...
*Wednesday, January 28, 2015 at 7:46am*

**Physics**

An archer's bow applies a force to an arrow over a distance of 19cm, while firing it vertically upwards. If the arrow achieves a speed of 8.0m/s and the efficiency of the bow is 75%, determine the average force applied to the arrow by the bow. So far I have the Wnet for ...
*Wednesday, January 28, 2015 at 2:49am*

**physics**

A net force of (2.5 N)i hat − (4.7 N)j hat acts on a 3.2 kg object. Find the acceleration a with arrow.
*Wednesday, January 28, 2015 at 2:43am*

**physics**

A particle is traveling in a straight line at a constant speed of 29.9 m/s. Suddenly, a constant force of 14.5 N acts on it, bringing it to a stop in a distance of 58.2 m. (a) What is the direction of the force? (b) Determine the time it takes for the particle to come to a ...
*Wednesday, January 28, 2015 at 2:41am*

**maths**

A survey o 85 students asked them about the subjects they liked to study 35 students liked maths,37liked history,26 liked physics,20 liked maths and history,14 liked maths and physics,2 liked all the subjects. a) how many of these students like maths and physics? B) how many ...
*Wednesday, January 28, 2015 at 1:35am*

**Physics**

What mass of water requires 1.89X10^8 joules of energy to heat from 15 degrees Celsius to 75 degree celsius? The specific heat of water is 4190 J/kg degree celsius
*Wednesday, January 28, 2015 at 1:28am*

**Physics**

How much heat is contained in 100 kg of water at 60.0 °C?
*Tuesday, January 27, 2015 at 11:14pm*

**Physics**

A soccer ball is kicked with a velocity of 12m/s, HORIZONTALLY off a building which is 8.5m high. What is the velocity of the ball after 1.25s? This is what I found so far: Vi = 12m/s Dx = 15.8049336m Dy = 8.5m Time it took for ball to hit floor 1.31707778s I used D=Vi(T) + 1/...
*Tuesday, January 27, 2015 at 10:21pm*

**physics**

6) CRITICAL THINKING: Kinematic equations are only valid for situations with constant acceleration. Using Newton’s second law, explain some examples of non-constant acceleration?
*Tuesday, January 27, 2015 at 9:43pm*

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