# Math/Physics

215,206 results, page 69

1. ### physics

An object is projected at an angle of elevation of 45 degree with a velocity of 100 m/s calculate its range
2. ### Physics

A 100-n boulder is sitting on a shelf 0.5 meters above the floor. What is the potential energy when its in its new location?
3. ### physics

A boy sledding down a hill accelerates at 2.00 m/s2. If he started from rest, in what distance would he reach a speed of 5.20 m/s?
4. ### maths lit,physics,life science n tourism

i don't know which career to choose can you help me ?I'm doing grade 11.
5. ### Physics

An airplane lands and starts down the runway at a southwest velocity of 41 m/s. What constant acceleration allows it to come to a stop in 1.3 km?
6. ### physics

A car going at 30 m/s undergoes an acceleration of 2m/s squared for 4 seconds. What is it's final speed? How far did it travel while it was accelerating?
7. ### physics

Calculate the distance you will travel if you maintain an average speed of 12km/h for one-half hour.
8. ### Physics

An airplane is flying at an altitude of 2,000 m with a speed of 216 m/s. What is the pressure of air outside the plane?
9. ### Physics/ Science

Cars A and B, each moving at 70 km/h, are approaching one another on a straight highway. After how many seconds will they meet if they were initially 1 km apart?
10. ### physics

calculate the energy evolved when 8 droplets of water of radius 1/2mm each combine into one. where S=0.072N/m
11. ### physics

if the masses remain the same ,but the separation is decreased to one-half of the original distance . what happens to the gravitation force?
12. ### physics

If you do 110 J of work to elevate a bucket of water, how much energy did you add to the gravitational field?
13. ### jru-physics

what potential energy is acquired by a block of steel whose mass is 50 kg when it is raised 200 cm?
14. ### physics

calculate the energy evolved when 8 droplets of water of radius 1/2mm each combine into one. where s=0.072N/m.
15. ### physics

how many revolutions per minute would a 15 m ferris wheel need to make for passengers to feel weightless at the top?
16. ### physics

the density of a block of wood with a colume of 50 cubic centimeters and a mass of 10o grams is

What resistance would produce a current of 120 amps from a 6-volt battery?
18. ### physics

what force is acting on a circular platform rotating opposite of a person standing on the edge?
19. ### physics

A capacitor has a capacitance of 3 pF. What potential difference would be required to store a charge of 21 pC? Choose one answer. a. 3 V b. 21 V c. 7 V d. 0.14 V
20. ### physics

If a race car completes a 4mi oval track in 73.2s, what is the average speed in units of mi/h?
21. ### physics

1. How much does it cost to operate a 75 W lamp continuously for 1 week if the power utility rate is 7/kWh?
22. ### Physics

What coefficient of friction is required to stop a hockey puck sliding at 12.8 m/s initially over a distance of 66.5 m?
23. ### physics

a 10,000hg car rounds a curve of radius 1200ft at 50mph what is its centripetal acceleration?

What is the current produced by a 9-volt battery flowing through a resistance of 2 x 10^-4 ohms?
25. ### Physics

A solid weigh 45N and 15N respectively in air and water. Calculate the relative density
26. ### Physics

Q: A car travels in a straight line for 4.6 h at a constant speed of 95 km/h . What is its acceleration? Answer in units of m/s 2
27. ### physics

If you heat a thin circular ring in a oven, does the rings hole get larger or smaller.why?
28. ### physics

Mechanical energy is the difference between the kinetic and potential energies of an object. true or false?
29. ### Physics

Calculate the speed of an 7.8×104 kg airliner with a kinetic energy of 1.0 × 109 J. Answer in units of m/s.
30. ### Physics

When you swim across a river does the time it takes to get to the other side depend on the rate of flow of the water?
31. ### Physics

An elevator is moving upward at 1.03 m/s when it experiences an acceleration 0.31 m/s2 downward, over a distance of 0.73 m. What will its final velocity be?

What voltage is necessary to produce a current of 200 amperes through a resistance of 1 x 10^-3 ohms?
33. ### Physics

How many calories of heat will a person lose by evaporating 1250g of water and perspiration in a day?
34. ### College physics

You have a collection of six 1.0 kilo ohm resistors. what is the smallest resistance you can make by combining them
35. ### physics

In the Melde's string apparatus, why there is no standing wave in the segment between the pulley and mass hanger?
36. ### College Physics

If the uncertanty in the slope is 1.214×10-14, is the measured value of ε0 within experimental uncertainty of the accepted value? (Yes or No)
37. ### Physics

An iron railroad track 1000 feet long is at a temperature of 0 oC. How much does it expand when heated to 33 oC?
38. ### physics

A boy hops on his bike and rides 135 meters in 20 seconds. What is his average speed?
39. ### PHYSICS ROLLING MOTION!!!

A unicycle with a tire 44.0 cm in diameter travels 2.00 km. How many revolutions does the wheel make?
40. ### Physics

Find the maximum height reached by a ball thrown upward at a velocity of 95ft/s
41. ### Physics

A positive and a negative charge, each of magnitude 1.0 10-5 C, are separated by a distance of 12 cm. Find the force on each of the particles
42. ### Physics

what is the mass of hydrogen peroixide, H2O2, in 350 grams ofa 20% by weight solution?
43. ### physics

A boy hops on his bike and rides 135 meters in 20 seconds. What is his average speed?
44. ### physics

what is the formula to calculate the following: how much force is needed to move a 10 pound block 10 feet in 8 seconds>
45. ### physics

Frequency and period are related, in that they are which of the following?A) inverses of each other.B) None of these.C) both on the same wavelength.D) directly proportional to each other.E) two expressions for much the same thing.
46. ### Physics

A cricket jumps vertically upwards, and remains in the air for 1.6 s. At what speed did it leave the ground?
47. ### Physics

a coin is placed on a stereo revolving at 33.3 revolutions per minute. what is its centripetal acceleration when it is placed 5 cm from the center of the turntable?
48. ### 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?
49. ### physics

If an 80kg sprinter can accelerate from a standing start to a speed of 10 m/s in 3 s, what average power is generated?
50. ### Physics

A 1300 sports car accelerates from rest to 90 in 6.5 . What is the average power delivered by the engine?
51. ### Physics

Two positive charges of 0.2microC and 0.01 microC are placed 10cm apart. Calculate the work done in reducing their distance to 5 cm
52. ### Physics

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

A aluminum wire has a diameter and uniform electric field of imposed along its entire length
54. ### physics

if a race car's velocity increases from 4 m/s to 36 m/s over a 4 s time interval, its average acceleration would be 10 m/s 2 ? IS THIS TRUE ?
55. ### physics

A motorcycle, initially traveling at a speed of 14 m/s, slows down (decelerates) at a rate of -3.5 m/s2 for 2 s. How far does it travel during that time?
56. ### physics

A current of 1 A is maintained in a simple circuit with a total resistance of 2.5 Ω. How much heat is generated in 4.0 s?
57. ### physics

What magnitude point charge creates a 13000 N/C electric field at a distance of 0.220 m?
58. ### physics

A car traveling at 70 km/h. It then accelerates at 3.6m/s^2 to 90km/h. How long does it take to reach a new speed. How far does it travel during acceleration
59. ### physics

An airplane lands and starts down the runway at a southwest velocity of 44 m/s. What constant acceleration allows it to come to a stop in 1.3 km?
60. ### physics

a 60kg sprinter accelerates from rest at 2.5m/s east for 4s. what force is acting and what is his final speed?
61. ### physics

Calculate the extension that would be produced by a 20N force if 15N extends a spring by 3cm
62. ### physics

find the altitude change of a 10000-kg fighter which clims and in so doing, loses 100 m/s of airspeed
63. ### physics

if two forces 10N and 20N are inclined at angle 60degree to each other. Find the resultant force.
64. ### Physics

A stone is dropped into a bore well 490m deep.after how time,the sound of splash of will be heard
65. ### Physics

A person is travelling 6 km (E) then 4 km (N) and finally 2 km (W). Calculate the average speed And velocity. Show your work
66. ### Physics

Two violin players tuning their instruments together hear 8 beats in 2 s. What is the frequency difference between the two violins
67. ### Physics

Consider a pair of planets for which the distance between them decreases by a factor of 5. Demonstrate that the force between them becomes 25 times greater
68. ### physics

state the surface powers required to produce the following lenses with +6.25D front curves. a. -0.50 DS 6. +0.50 DS c. +1.75 DS
69. ### Physics

A 3kw engine operates for 3secs, 10kgf force is applied find the Displacement.
70. ### Physics 2

What quantity of heat is needed to convert 1kg of ice at -10C to liquid at 20C?
71. ### physics

What is quantity of heat required to melt down completely 1kg of ice at 30 degree celsius
72. ### physics: relativity

I think I can rearrange the Lorentz contraction equation, solving for v using: v=sqrt[1-(L/Lo)^2] x c^2 Would someone check my thinking please? Thanks
73. ### Physics

What effort is exerted to lift a load of 150N with a machine having a velocity ratio of 3 and efficiency of 20%
74. ### Physics

What is the frictional force between the tires of a 2000 kg car and an asphalt road if the coefficient of friction is 1.2?
75. ### Physics

If 2.4 m3 of a gas initially at STP is compressed to 1.6 m3 and its temperature raised to 30oC, what is the final pressure?
76. ### Physics

How Fast would a satellite have to move to stay in an orbit 300 miles above the Earths surface?
77. ### Physics

What is the difference between 110, 220 and 440 volts. How does amperage play a role with voltage
78. ### Physics

The speed of light in vacuum depends on, 1)wavelength 2)frequency 3)intensity 4)temperature 5)none of the above I know that 1 and 2 are correct. What about the others?
79. ### physics

A spring has k = 88 N/m. Use a graph to determine the work needed to stretch it from x = 3.6 cm to x = 5.6 cm, where x is the displacement from its unstretched length.
80. ### physics

if a train at 72kmphr is to be brought to rest in a distance of 200 m then its retardation is A 20m/s^2 b 10m/s^2 c 2m/s^2 d 1m/s^2
81. ### physics

A plane cruising at 251 m/s accelerates at25 m/s2 for 9 s.What is its final velocity?Answer in units of m/s
82. ### Physics

What is the frictional force between the tires of a 2000 kg car and an asphalt road if the coefficient of friction is 1.2?
83. ### physics

what is the heat required to convert 0.1 kg of melting ice into steam at 100 degree celcius
84. ### Physics

How long will it take a 1830 W motor to lift a 285 kg piano to a sixth-story window 16.0 m above?
85. ### Physics

Calculate the length of a displaced pendulum Bob which pass through its lowest point twice every second. Take g=10m/s²
86. ### physics

A car travels in a straight line for 5 h at a constant speed of 73 km/h . What is its acceleration? Answer in units of m/s2
87. ### physics

A uniform rod of 1 meter is bent at its midpoint to make90.The distance from its centre of mass
88. ### PHYSICS

Calculate for Bohr's atomic model the speed of the orbiting electron in the n = 7 state. (Answer in m/s)
89. ### physics

Find the field produced by a uniformly charged sheet carrying 93pC/cm2 .
90. ### physics

Three resistors, 1.17, 2.84, and 3.65Ω, are connected in series across a 20.3-V battery. Find the power delivered to each resistor.
91. ### physics

What is the period and frequency of a 10-pound weight oscillating (as a pendulum) on a 5-meter-long rope?
92. ### Physics

a woman on a bridge 75 high sees a raft floating at a constant speed on the river below.
93. ### Physics

A 83.0-kg person, hanging from a rope, is being pulled away from a burning building by a firefighter, as shown in the figure below.
94. ### physics

you are to determine the amount of sugar dissolved in solution. how can you use polaroid filters to complete the task?
95. ### Physics

A stone is dropped into a bore well 490m deep.after how time,the sound of splash of will be heard
96. ### physics

a child twirls a yo-yo about in a horizontal circle. The yo-yo has a mass of 0.20 kg and is attached to a string 0.8 m long. what is the velocity of the yo-yo? thanks!
97. ### physics

What coefficient of friction is required to stop a hockey puck sliding at 12.3 m/s initially over a distance of 38.7 m?
98. ### physics

How much work must an ideal refrigerator perform to make 1 kg of ice at -10C from 1 kg of water at 20C when 20C is also its exhaust temperature?
99. ### physics

Three resistors, 1.17, 2.84, and 3.65Ω, are connected in series across a 20.3-V battery. Find the power delivered to each resistor.
100. ### physics

Two stones one at equator and the other at poles are allowed to fall from same height and at same time.which one will strike the ground first?