phy

Most popular questions
1. PHY

Two snowcats tow a housing unit to a new location at McMurdo Base, Antarctica, as shown in Figure 4-46. The sum of the forces A and B exerted on the unit by the horizontal cables is parallel to the line L, and FA = 4300 N. Determine FB and the magnitude of

asked by AMI on September 13, 2010
2. phy

A blue ball is thrown upward with an initial speed of 20.6 m/s, from a height of 0.8 meters above the ground. 2.5 seconds after the blue ball is thrown, a red ball is thrown down with an initial speed of 8.2 m/s from a height of 23.7 meters above the

asked by a on September 13, 2011
3. phy

A slab of ice floats on a freshwater lake. What minimum volume must the slab have for a 50.0kg woman to be able to stand on it without getting her feet wet?

asked by shree on November 29, 2013
4. phy

Review. An object with a mass of m 5 5.10 kg is attached to the free end of a light string wrapped around a reel of radius R 5 0.250 m and mass M 5 3.00 kg. The reel is a solid disk, free to rotate in a vertical plane about the horizontal axis passing

asked by Anonymous on January 3, 2013
5. PHY

Arlene is to walk across a “high wire” strung horizontally between two buildings 10.0 m apart. The sag in the rope when she is at the midpoint is 10.0º as shown in the figure below. If her mass is 50.0 kg, what is the tension in the rope at this

asked by mei on November 28, 2017
6. phy

A grinding wheel 0.62 m in diameter rotates at 2400 rpm. (a) Calculate its angular velocity in rad/s. rad/s (b) What are the linear speed and acceleration of a point on the edge of the grinding wheel? linear speed m/s radial acceleration m/s2

asked by mas on October 16, 2010
7. phy

A grinding wheel 0.62 m in diameter rotates at 2400 rpm. (a) Calculate its angular velocity in rad/s. rad/s (b) What are the linear speed and acceleration of a point on the edge of the grinding wheel? linear speed m/s radial acceleration m/s2

asked by mas on October 16, 2010
8. phy

A 3.50 kg block on a smooth tabletop is attached by a string to a hanging block of mass 2.80 kg. The blocks are released from rest and allowed to move freely. 1-Is the tension in the string greater than, less than, or equal to the weight of the hanging

asked by ivan on July 18, 2011
9. phy

A block of mass 2.20 kg is accelerated across a rough surface by a light cord passing over a small pulley as shown in the figure below. The tension T in the cord is maintained at 10.0 N, and the pulley is 0.120 m above the top of the block. The coefficient

asked by alix on February 11, 2014
10. phy

A child goes down a playground slide with an acceleration of 1.36 m/s^2. 1-Find the coefficient of kinetic friction between the child and the slide if the slide is inclined at an angle of 28.0 deg below the horizontal.

asked by pop on July 18, 2011
11. phy

A major-league catcher gloves a 92 mi/h pitch and brings it to rest in 0.15 m. 1-If the force exerted by the catcher is 803 N, what is the mass of the ball?

asked by pop on July 17, 2011
12. phy

A force of magnitude 7.50 N pushes three boxes with masses m_1 = 1.30 kg,m_2 = 3.20 kg, and m_3 = 4.90 kg .The mass is side by side. 1-Find the magnitude of the contact force between boxes 1 and 2, and 2-Find the magnitude of the contact force between

asked by susan on July 18, 2011
13. phy

An electric kettle contains 1.5 kg of water at 100o C and powered by a 2.0 kW electric element. If the thermostat of the kettle fails to operate, approximately how long will it take for the kettle boil dry? (Take the specific latent heat of vaporization of

asked by christ on January 24, 2013
14. phy

An archer shoots an arrow horizontally at a target 14 m away. The arrow is aimed directly at the center of the target, but it hits 52 cm lower. 1-What was the initial speed of the arrow? ** is this the formula for finding t : y=h-1/2(gt^2)=

asked by pop on July 6, 2011
15. phy

A vertical spring (ignore its mass), whose spring stiffness constant is 1000 N/m, is attached to a table and is compressed down 0.130 m. (a) What upward speed can it give to a 0.200 kg ball when released? m/s (b) How high above its original position

asked by mas on September 26, 2010
16. Phy

A uniform beam of length l whose mass is 3.5kg rests with its ends on two digital scales. A block with a mass of 1.3kg rests on the beam, 1/4 of the distance in from the left balance. What do the scales read?

asked by Ashley on November 4, 2015
17. PHY

. Four identical metal spheres have charges of qA = –8.0 µC, qB =–2.0 µC, qC = +5.0µ C, and qD = +12.0µ C. (a) Two of the spheres are brought together so they touch, and then they are separated. Which spheres are they, if the final charge on each

asked by Saif on February 17, 2013
18. phy

A golfer gives a ball a maximum initial speed of 37.0 m/s. 1-What is the highest tree the ball could clear on its way to the longest possible hole-in-one?

asked by elin on July 9, 2011
19. phy

An automobile engine slows down from 3500 rpm to 1100 rpm in 4.5 s. (a) Calculate its angular acceleration, assumed constant. rad/s2 (b) Calculate the total number of revolutions the engine makes in this time. rev I got answer for part a that is

asked by mas on October 16, 2010
20. phy

force in the x-direction with magnitude Fx=18N-(0.530N/m)x is applied to a 5.50 box that is sitting on the horizontal, frictionless surface of a frozen lake. is the only horizontal force on the box. what is the speed after 12m. starting from rest and x=0

asked by lvf on October 9, 2012
21. PHY

The components of a vector V can be written (Vx, Vy, Vz). What are the components and length of a vector which is the sum of the two vectors, V1 and V2, whose components are (5.0, 1.3, -15.0) and (2.3, -4.7, -1.0)?

asked by ami on August 22, 2010
22. phy

a watermelon seed has the following coordinates: x= -5.0, y = 8.0m, and z = 0m. find its position vector (a) in unit-vector notation and as (b) a magnitude and (c) an angle relative to the positive direction of the x axis (d) sketch the vector on the

asked by stephen on February 9, 2013
23. phy

An 85 g arrow is fired from a bow whose string exerts an average force of 95 N on the arrow over a distance of 85 cm. What is the speed of the arrow as it leaves the bow?

asked by mas on September 25, 2010
24. phy

a rubber ball is thrown against a horizontal wall and bounces back with the same speed it came in at. The change in momentum vector of the ball is A) 10 m/s^2 B) in the same directions the ball's initial motion C) in the opposite direction as the ball's

asked by carol on November 4, 2016
25. phy

An archer shoots an arrow horizontally at a target 14 m away. The arrow is aimed directly at the center of the target, but it hits 52 cm lower. 1-What was the initial speed of the arrow?

asked by susan on July 5, 2011
26. phy

A cube of ice is taken from the freezer at -7.5°C and placed in a 101 g aluminum calorimeter filled with 282 g of water at room temperature of 20°C. The final situation is observed to be all water at 16°C. What was the mass of the ice cube?

asked by ami on December 2, 2010
27. phy

A boat can travel 2.60 m/s in still water.If the boat points its prow directly across a stream whose current is 1.10 m/s, what is the velocity (magnitude and direction) of the boat relative to the shore? What will be the position of the boat, relative to

asked by ami on September 5, 2010
28. phy

A baseball (m = 145 g) traveling 45 m/s moves a fielder's glove backward 15 cm when the ball is caught. What was the average force exerted by the ball on the glove? find Magnitude

asked by mas on September 26, 2010
29. phy

Snowballs are thrown with a speed of 11 m/s from a roof 6.0 m above the ground. Snowball A is thrown straight downward; snowball B is thrown in a direction 20^\circ above the horizontal. 1-Find the direction of motion of the two snowballs just before they

asked by pop on July 9, 2011
30. phy

An ordinary glass is filled to the brim with 350.0 mL of water at 100°C. If the temperature decreased to 19°C, how much water could be added to the glass?

asked by ami on November 24, 2010
31. phy

A car at the Indianapolis-500 accelerates uniformly from the pit area, going from rest to 340 km/h in a semicircular arc with a radius of 196 m. Determine the tangential acceleration of the car when it is halfway through the turn, assuming constant

asked by ami on September 18, 2010
32. PHY

The coefficient of static friction between hard rubber and normal street pavement is about 0.68. On how steep a hill (maximum angle) can you leave a car parked?

asked by ami on September 12, 2010
33. phy

(Q1)A wire of cross- sectional area of 0.00006m2 and length 50cm stretches by 0.2mm under a load of 3000n.Calculate the Young's modulus for the wire (a)80000000000Nm-2(b)125000000000Nm-2(c)25000000000Nm-2(d)5000000000Nm-2 (Q2)a square plate of side 10cm is

asked by kate on July 3, 2013
34. phy

Two snowcats tow a housing unit to a new location at McMurdo Base, Antarctica, as shown in Figure 4-46. The sum of the forces A and B exerted on the unit by the horizontal cables is parallel to the line L, and FA = 4300 N. Determine FB and the magnitude of

asked by ami on September 12, 2010
35. phy

A baseball (m = 145 g) traveling 45 m/s moves a fielder's glove backward 15 cm when the ball is caught. What was the average force exerted by the ball on the glove? find Magnitude

asked by mas on September 26, 2010
36. PHY

Vector V1 is 9.00 units long and points along the negative x axis. Vector V2 is 4.72 units long and points at +50.0° to the +x axis. (a) What are the x and y components of each vector? V1x = V1y = V2x = V2y = (b) Determine the sum V1 + V2. Magnitude AND

asked by ami on August 22, 2010
37. phy

A 1200 kg car traveling north at 10 m/s is rear-ended by a 2000 kg truck traveling at 27 m/s. What is the total momentum before and after the collision? before collision after collision

asked by ME on November 2, 2016
38. phy

A baseball is thrown horizontally from the top of a cliff 50 meters up. The initial velocity of the ball is 10 m/s. How far from the base of the cliff will the ball land?

asked by Anonymous on March 5, 2014
39. Phy

A non conducting sphere of radius r charged uniformly with surface charge density sigma rotates with angular velocity omega about the axis passing through its centre. Find the magnetic induction at the centre of sphere.

asked by Atharva Mandlik on June 22, 2017
40. phy

A sled is initially given a shove up a frictionless 27.0° incline. It reaches a maximum vertical height 1.45 m higher than where it started. What was its initial speed?

asked by mas on September 26, 2010
41. phy

A 10kg mass and a 2.0kg mass are connected by a light string over a massless, frictionless pulley. if g=9.8ms^-2, what is the acceleration of the system when released? (98ms^-2)

asked by saima on January 7, 2015
42. phy

Boy throws a penny into a wishing well at a velocity of 2 m/s and at an angle of 45 degrees below horizontal. If the penny takes 1.3 seconds to hit the water, how deep is the well?

asked by Anonymous on March 5, 2014
43. phy

A 175 kg horizontal beam is supported at each end. A 300 kg piano rests a third of the way from one end. What is the vertical force on the support closest to the piano? N What is the vertical force on the support furthest from the piano? N

asked by ami on October 22, 2010
44. phy

What is the distance from the Earth's center to a point outside the Earth where the gravitational acceleration due to the Earth is 1/12 of its value at the Earth's surface?

asked by ami on September 17, 2010
45. phy

Calculate the average translational kinetic energy of a nitrogen molecule at 27 degree celcius

asked by christ on January 24, 2013
46. phy

What mass of steam at 100°C must be added to 1.00 kg of ice at 0°C to yield liquid water at 15°C?

asked by ami on December 2, 2010
47. phy

an ungraduated mercury thermometer attached to a millimeter scale reads 22.8mm in ice and 242mm in steam at standard pressure. What will the millimeter read when the temperature is 20

asked by kate on July 2, 2013
48. phy

Doppler ultrasound is used to measure the speed of blood flow. If the speed of the red blood cells is v, the speed of sound in blood is u, the ultrasound source emits waves of frequency f, and we assume that the blood cells are moving directly toward the

asked by kira on April 12, 2013
49. phy

a landscape architect is planning an artificial waterfall in a city park. water flowing at 1.70 m/s will leave the end of a horizontal channel at the top of a vertical wall h =2.35 m high . and from there it will fall into a pool ( Fig . P4.18) (a) will

asked by ali on May 31, 2017
50. phy

A bicycle and its rider together has a mass of 62 kg. What power output of the rider is required to maintain a constant speed of 4.6 m/s (about 10.3 mph) up a 5.0% grade (a road that rises 5.0 m for every 100 m along the pavement)? Assume that frictional

asked by kyoya on February 25, 2013
51. PHY

A drag-racing car accelerates forward because of the force exerted on it by the road. Why, then, does it need an engine? Explain. what is the answer plz

asked by MHD on May 11, 2012
52. phy

A centrifuge rotor rotating at 13,000 rpm is shut off and is eventually brought uniformly to rest by a frictional torque of 1.30 m·N. If the mass of the rotor is 4.80 kg and it can be approximated as a solid cylinder of radius 0.0710 m, through how many

asked by mas on October 16, 2010
53. phy

A certain CD has a playing time of 72 minutes. When the music starts, the CD is rotating at an angular speed of 4.8 102 revolutions per minute (rpm). At the end of the music, the CD is rotating at 2.1 102 rpm. Find the magnitude of the average angular

asked by nn on November 8, 2015
54. phy

A force of magnitude 7.50 N pushes three boxes with masses m_1 = 1.30 kg,m_2 = 3.20 kg, and m_3 = 4.90 kg .The mass is side by side. 1-Find the magnitude of the contact force between boxes 1 and 2, and 2-Find the magnitude of the contact force between

asked by lily on July 17, 2011
55. phy

Jane, looking for Tarzan, is running at top speed (4.3 m/s) and grabs a vine hanging vertically from a tall tree in the jungle. How high can she swing upward?

asked by mas on September 26, 2010
56. phy

A car at the Indianapolis-500 accelerates uniformly from the pit area, going from rest to 340 km/h in a semicircular arc with a radius of 196 m. Determine the tangential acceleration of the car when it is halfway through the turn, assuming constant

asked by ami on September 19, 2010
57. phy

An engine absorbs 2000j of heat from a hot reservoir and expels 750j to a cold reservoir during each poerating cycle, (i)what is the efficiency of the engine (ii)How much work is done during the cycle? (iii)What is the power output of the engine if each

asked by kate on July 4, 2013
58. Phy

A 17kg child slides down a 2.7m -high playground slide. She starts from rest, and her speed at the bottom is 1.8 m/s. What is the change in the thermal energy of the slide and the seat of her pants?

asked by Mary on November 28, 2012
59. phy

A force of magnitude 7.50 N pushes three boxes with masses m_1 = 1.30 kg,m_2 = 3.20 kg, and m_3 = 4.90 kg .The mass is side by side. 1-Find the magnitude of the contact force between boxes 1 and 2, and 2-Find the magnitude of the contact force between

asked by ana on July 18, 2011
60. phy

Starting from rest, a car accelerates at 3.0 m/s^2 up a hill that is inclined 5.9 ^\circ above the horizontal. 1-How far horizontally has the car traveled in 14 s? 2-How far vertically has the car traveled in 14 s?

asked by elin on July 4, 2011
61. phy

An 90 kg person steps into a car of mass 2600 kg, causing it to sink 2.35 cm on its springs. Assuming no damping, with what frequency will the car and passenger vibrate on the springs?

asked by klk on December 4, 2010
62. phy

A wind turbine is initially spinning at a constant angular speed. As the wind's strength gradually increases, the turbine experiences a constant angular acceleration 0.130 rad/s2. After making 2844 revolutions, its angular speed is 136 rad/s. (a) What is

asked by ang on April 14, 2016
63. Phy

a resistance of platinum wire is 2 ohm at zero degree and 2.5 at 100 degree.then at what temperature its resistance would be 2.3 ohm.

asked by Shikha on May 4, 2016
64. phy

At a factory, a noon whistle is sounding with a frequency of 484 Hz. As a car traveling at 77 km/h approaches the factory, the driver hears the whistle at frequency fi. After driving past the factory, the driver hears frequency ff. What is the change in

asked by kira on April 12, 2013
65. phy

A piece of plastic barely floats in water. If it has a mass of 20g, what is its volume?

asked by christ on January 24, 2013
66. Phy

A 2.0 kg ball is placed against a spring of force constant 750N/m, which has been compressed 0.28m. The spring is released and the ball moves along a horizontal frictionless surface and up a ramp. Calculate the... a) maximum elastic potential energy of the

asked by Shanelle on January 14, 2013
67. phy

A major-league catcher gloves a 92 {\rm mi}/{\rm h} pitch and brings it to rest in 0.15 {\rm m}. 1-If the force exerted by the catcher is 803 {\rm N}, what is the mass of the ball?

asked by ivan on July 16, 2011
68. phy

Two crates, of mass m1 = 60 kg and m2 = 130 kg, are in contact and at rest on a horizontal surface (Fig. 4-54). A 620 N force is exerted on the 60 kg crate. The coefficient of kinetic friction is 0.15.

asked by ami on September 12, 2010
69. phy

A car of mass 1400kg moving south at 11m/s collides into another car of mass 1800kg moving east at 30m/s.The cars are stock together after the collision.Determine the velocity of the cars immediately after the collision.

asked by pawan mandal on March 25, 2016
70. phy

A marble slides without friction in a vertical plane around the inside of a smooth, 21 cm-diameter horizontal pipe. The marble's speed at the bottom is 4.5 m/s this is fast enough so that the marble makes a complete loop, never losing contact with the

asked by Naso on March 23, 2010
71. phy

A 45 kg crate is placed on an inclined ramp. When the angle the ramp makes with the horizontal is increased to 22 deg , the crate begins to slide downward. 1-What is the coefficient of static friction between the crate and the ramp? 2-At what angle does

asked by poul on July 18, 2011
72. phy

(Q1)At what altitude above the earth's surface would the acceleration due to gravity be 4.9m/s-2?Assuming the mean radius of the earth is 64000000meters and the acceleration due to gravity 9.8m/s-2 on the surface of the earth

asked by ikye on July 5, 2013
73. phy

A stone is thrown upward from the edge of a cliff overlooking the ocean. The initial speed of the stone is 20m/s, and it's thrown up at an angel of 30 degrees with respect to the horizontal. the cliff is 45m above the ocean surface. How long is the stone

asked by nicky on October 12, 2012
74. phy

The small archerfish (length 20 to 25 cm) lives in brackish waters of Southeast Asia from India to the Philippines. This aptly named creature captures its prey by shooting a stream of water drops at an insect, either flying or at rest. The bug falls into

asked by kia on February 15, 2011
75. phy

A 290 kg piano slides 4.6 m down a 30° incline and is kept from accelerating by a man who is pushing back on it parallel to the incline. The effective coefficient of kinetic friction is 0.40. (a) Calculate the force exerted by the man. N (b) Calculate the

asked by mas on September 25, 2010
76. phy

Two constant forces act on an object of mass m = 4.50 kg object moving in the xy plane as shown in the figure below. Force 1 is 21.0 N at 35.0°, and force 2 is 47.0 N at 150°. At time t = 0, the object is at the origin and has velocity (3.70 + 2.25) m/s.

asked by patel on November 20, 2012
77. phy

Three blocks are suspended at rest by the system of strings and frictionless pulleys shown in the figure below, where W = 29.0 N, and è = 26.6°. What are the weights w1 and w2?

asked by anthony on October 25, 2012
78. PHY

Overall, the physical properties of minerals provide a reliable means to identify common minerals. However, certain properties can exhibit a range of characteristics or values making them less useful for identification purposes. Choose 2 physical

asked by Anonymous on June 1, 2011
79. phy

A ball of mass 0.540 kg moving east (+x direction) with a speed of 3.30 m/s collides head-on with a 0.740 kg ball at rest. If the collision is perfectly elastic, what will be the speed and direction of each ball after the collision? a)ball originally at

asked by ami on October 7, 2010
80. phy

Two crates, of mass m1 = 60 kg and m2 = 130 kg, are in contact and at rest on a horizontal surface (Fig. 4-54). A 620 N force is exerted on the 60 kg crate. The coefficient of kinetic friction is 0.15. (a) Calculate the acceleration of the system.(to the

asked by AMI on September 13, 2010
81. phy

A 72.7 kg student runs up the stairs of a football stadium to a height of 11.9 m above the ground in 10.1 s. (a) What is the power of the student in kilowatts?

asked by ddreww on October 29, 2014
82. phy

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 . Part A What would be the magnitude of the gravitational force exerted

asked by kerat on July 13, 2013
83. phy

A very thin hollow conducting sphere has a radius of R=0.12 m. The center of the sphere is at S. A charge of q=7×10−6 C is present at point P which is located d=0.09 m from S. Assume that this charge stays at this position (thus it cannot move). We draw

asked by Evans on March 25, 2013
84. phy

Calculate the density for a rectangular block using the following measurements. Length: 2.70 cm, Width: 1.10 cm, Height: 9.09 cm, Mass: 72.17 g. Round your answer for density to 2 decimal places. Include the correct unit for density. Show your work

asked by irtaza on May 18, 2011
85. phy

A scuba diver and her gear displace a volume of 71.0 L and have a total mass of 64.0 kg. (a) What is the buoyant force on the diver in sea water?

asked by mas on November 4, 2010
86. phy

A 900 kg car rolling on a horizontal surface has speed v = 70 km/h when it strikes a horizontal coiled spring and is brought to rest in a distance of 2.2 m. What is the spring stiffness constant of the spring?

asked by mas on September 26, 2010
87. phy

A horse canters away from its trainer in a straight line, moving 140 m away in 16.0 s. It then turns abruptly and gallops halfway back in 5.0 s. (a) Calculate its average speed. (b) Calculate its average velocity for the entire trip, using "away from the

asked by ami on August 27, 2010
88. phy

Calculate the change in internal energy of 2kg of water at 90 degree celcius when it is changed to $3.30m^{3}$ of steam at $100 ^{o}$C. The whole process occurs at atmospheric pressure. The latent heat of vaporization of water is $2.26\times10^{6}$ J/kg.

asked by Emma on March 18, 2015
89. phy

A 2000 kg satellite orbits the earth at a height of 300 km. What is the speed of the satellite and its period? Take , Mass of the earth is kg

asked by squ on September 14, 2014
90. phy

A body hangs from a spring balance supported from the roof of an elevator. If the elevator has an upward acceleration of 3ms−2 and the balance reads 50 N, what is the true weight of the body?

asked by samson on August 13, 2014
91. phy

. Show that 480 W of power is expended by a weightlifter when lifting a 60-kg barbell a vertical distance of 1.2 m in a time interval of 1.5 s.

asked by merle on February 17, 2013
92. phy

At what temperature will the root-mean-square speed of oxygen molecules have the value of 640 m/s? 1 kilomole of oxygen has a mass of 32kg.

asked by christ on January 24, 2013
93. phy

A major-league catcher gloves a 92 mi/h pitch and brings it to rest in 0.15 m. 1-If the force exerted by the catcher is 803 N, what is the mass of the ball?

asked by lily on July 17, 2011
94. phy

2 kg of water at 5 celsius is added to ice at 0 celsius. The ice and water make up a closed system. Calculate how much of the ice melts

asked by brandy on December 4, 2010
95. phy

why archimedes principle lab has more percentage errors or discrepancy than expected?

asked by mas on November 8, 2010
96. phy

Two crates, of mass m1 = 60 kg and m2 = 130 kg, are in contact and at rest on a horizontal surface (Fig. 4-54). A 620 N force is exerted on the 60 kg crate. The coefficient of kinetic friction is 0.15.

asked by ami on September 12, 2010
97. phy

A helicopter is ascending vertically with a speed of 5.50 m/s. At a height of 155 m above the Earth, a package is dropped from a window. How much time does it take for the package to reach the ground? [Hint: The package's initial speed equals the

asked by ami on August 26, 2010
98. phy

A scaffold of mass 50 kg and length 7.0 m is supported in a horizontal position by a vertical cable at each end. A window washer of mass 80 kg stands at a point 1.5 m from one end. (a) What is the tension in the cable closer to the painter? N (b) What is

asked by mark on December 13, 2008
99. phy

The thermal capacity of 10g of a substance is 8 calories. the specific heat is in J/kg-K

asked by yogeg on July 18, 2016
100. phy

(Q1)A gas occupies a certain volume at 27c.If it is heated at constant pressure, its volume is exactly doubled at a temperature of. (a)54c(b)219c(c)327c(d)600c (Q2)If the specific heat capacity of water initially is4.2000/kg/k and the difference in

asked by kate on July 3, 2013

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