# physics please HELP !

74,755 results, page 59
1. ## Physics

A car travels in a straight line for 4.8 h at a constant speed of 63 km/h . What is its acceleration? Answer in units of m/s 2
2. ## physics

A 4430-kg helicopter accelerates upward at 2.2 m/s2. What lift force is exerted by the air on the propellers?
3. ## physics

How long will it take a 1920 W motor to lift a 285 kg piano to a sixth-story window 16.0 m above?
4. ## physics

At 7.15 cents per kilowatt-hour, what does it cost to leave a 75.0W light burning 24.0 hours a day?
5. ## Physics Please

You want to show that V^2 - Vo^2 = 2 a (X - Xo) first rewrite that as: (V-Vo)(V+Vo) = 2a (X-Xo) now your average velocity during the interval = (V+Vo)/2 so X = Xo + t(V+Vo)/2 but V = Vo + a t so t = (V-Vo)/a so X = Xo +(V-Vo)(V+Vo)/2a we are there.
6. ## Physics

Inside a metal conductor, why is it not possible to have a static charge configuration if there is a net electric field?
7. ## Physics

To what potential a sphere of radius 10cm be charged so that the surface density of charge is equal to 1
8. ## physics

How do the acceleration vectors differ on opposite sides of the path for un iform circular motion? How are they the same?
9. ## PHYSICS

what is the central acceleration of an automobile driving at 40 kph on a circular tracks having radius of 30m?
10. ## Physics

A 150 kg body is at rest and covers the constant force needed to impart a velocity of 8m/s to it in 5s.
11. ## physics

A mass of 1kg is placed at 1m,2m,0.Another mere of 2kg is placed at 3m,4m,0.Find moment of inertia of both the ladder about z-axis
12. ## Physics

If the change in position Dx is related to velocity v (with units of m/s) in the equation Dx = Av, the constant A has which dimension? a. m/s^2 b. m c. s d. m^2 I chose b?
13. ## physics

a body is moving with uniform acceleration of 10m/s2.if it starts from rest calculate its displacement after 5s
14. ## Physics

What equations should I use to calculate the effective value of g, the acceleration of gravity (in meters/second^2), at 5800 km above the earth's surface?
15. ## physics

what is meant by liquefaction of gases? can hydrogen be liquefied by compression at the temperature of liquid air?
16. ## Physics

What is the strength of the magnetic field a distance of 1 meter from a wire carrying a current of 1 A? B=MoI ------ 2(pi)r Mo=4(pi)x 10^-7 I=1 A How do I know what r is?
17. ## physics

How long does it take a plane, traveling at a speed of 170 m/s, to fly once around a circle whose radius is 2900 m?
18. ## physics

A boy sledding down a hill accelerates at 1.30 m/s2. If he started from rest, in what distance would he reach a speed of 8.00 m/s?
19. ## Physics

I am curious how the earth work as an omnipresent conductive surface in an electrical distribution system?
20. ## Physics

From the position vs time graph of an object moving with constant acceleration, how could you find the velocity
21. ## Physics

How much potential energy is required to lift a 50 gram arrow to a height of 100 meters?
22. ## Physics

A 3.0 cmm high object is placed 10 cm from a concave mirror whose radius of curvature is 10 cm. Where is the image located?
23. ## PREAP Physics

From what height would a compact car have to be dropped to have the same kinetic energy that it has when being driven at 100 km/hr?
24. ## physics

Why does the pitch of the sound produce by blowing over an open end of a bottle change when you have more water in it?
25. ## Physics

a canon fires shell at 300m/s. at what angle must it aim to hit a target 5.0km away?
26. ## Physics

A golf ball struck with an initial speed of 41.8m/s. What is the range of the shot if the launch angle is 30.0º?
27. ## Physics

Two charges q1= -25 C and q3= 4.0 C are placed 0.012 m apart. A third negative charge, q2 is placed a distance L from q1 as shown. If the net electric force on q2 is 0N what is the value of L?
28. ## Physics

Calculate the velocity of a 6kg riffle that shoots a 0.025kg bullet at a speed of 615m/s.
29. ## physics

A 60 kg stunt person runs off a cliff at 5.3 m/s and lands safely in the river 11.8 m below. What was the splashdown speed?
30. ## Physics

A bowling bowl has a mass of 25 KG. What is the acceleration of the ball if an upward force of 110 N is applied?
31. ## physics

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

A family drives 400 milles in 8 hours. Explain how the acceleration of their car changed?
33. ## AP Physics

What minimum speed does a 130 g puck need to make it to the top of a 3.8 m -long, 23 ∘ frictionless ramp?
34. ## physics

an elevator weighing400kg is to be lifted up at a constant velocity of 3cms-1 what would be the minimum power of motor to be used
35. ## physics

A 15 kg box slides across the floor with an initial velocity of +7.6 m/s. It comes to a stop after sliding +14.8 m. How much friction was present?
36. ## physics

if the shortest lenght of the tube for resonance is 0.1m and next resonanc length is 0.35m what is the frequency of the vibration.
37. ## physics

What is the free-fall acceleration in a location where the period of a 2.87 m long pendulum is 3.4 s? Answer in units of m/s 2
38. ## physics

What is the radius of an automobile tire that makes a complete turn in 0.1 sec and has a linear speed of 24.0 m/s?
39. ## Science - Physics

how much power is in my bicep if i can lift 50kg a height of 50cm 40 times in one minute?
40. ## Physics

What is the frequency of an EM wave emitted most strongly by a glowing element on a stove with temperature 1500 K?
41. ## PHYSICS

two forces of magnitude 8N making an angle of 30 and 120 with xaxis . the y component of resultant A/ O B/ 4N C/ 8N D/ 16N
42. ## Physics

If a force of 15.0 N directed east acts on a stationary 5.00 kg mass, what are its acceleration, displacement, and velocity after 10.0 s?
43. ## physics

two forces of magnitude 8N making an angle of 30 and 120 with +xaxis . FInd the y component of reultant
44. ## Physics

If a force of 15.0 N directed east acts on a stationary 5.00 kg mass, what are its acceleration, displacement, and velocity after 10.0 s?
45. ## physics

A body is executing of amplitude 1m . Its velocity while passing through mean position is 10m/s . Find its frequency
46. ## physics

Calculate the time elapsed if the speed of a truck going south is reduced from 80 km/h to 44 km/h in a distance of 250 m.
47. ## physics

A cara accelerates uniformly from rest to a speed of 21.9 km/h in 8.5 s. Find the distance it travels during this time.
48. ## Physics

At its peak, a tornado is 60.0 m in diameter and carries 500 km/h winds. What is its angular velocity in revolutions per second?
49. ## Physics

What is the final velocity of a hoop that rolls without slipping down a 5.00-m-high hill, starting from rest?
50. ## 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?
51. ## physics-non calc

a hammer was released from rest vi=0m/s taking 1.12 seconds to fall 1 meter. How do you solve that
52. ## physics

a rolling ball covers a distance of 650m in 20 min. its speed in kilometer per hour will be what?
53. ## Physics

What is the centripetal acceleration of a skater moving with a tangential speed of 2.0 m/s in a circular path with radius 2.0 m?
54. ## Physics

A 1200 kg sports car accelerates from 0m/s to 27m/s in 10s. What is the average power of the engine?
55. ## 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?
56. ## 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?
57. ## physics

vector b has x,y, and z components of 4.0, 6.0, and 3.0 units, respectively. Calculate the magnitude of b and the angles that b makes with the coordinate axes.
58. ## physics

George takes off for a long jump at an angle of 28 degrees, and lands 6.9 m away. How fast was he when he jumped?
59. ## physics

Show that the acceleration is 7.5 m/s2 for a ball that starts from rest and rolls down a ramp and gains a speed of 30 m/s in 4 s
60. ## physics

The position of a particle moving along the x axis is given by x = (21 + 22t − 6t^2)m, where t is in s. What is the average velocity during the time interval t = 1s to t = 3s?
61. ## physics

4. What force is needed to push a 15 N object up a 20° incline at constant speed when the coefficient of friction is 0.30?
62. ## physics

4. What force is needed to push a 15 N object up a 20° incline at constant speed when the coefficient of friction is 0.30
63. ## Intro to Physics

With scanning probe microscopy technology, we see not actual atoms but rather images of them. Explain.
64. ## physics

A commuter backs her car out of her garage with an acceleration of 1.6 m/s2. How long does it take her to reach a speed of 2.3 m/s in seconds
65. ## Physics

A stone is thrown vertically upward with a speed of 19.0m/s How fast is it moving when it reaches a height of 10.0m
66. ## physics

If your boat weighs 1600 N, how much water will it displace when it’s floating motionless at the surface of a lake?
67. ## Physics

An airplane from rest accelerates on a runway at 5.50 m/s² for 20:25 seconds until it finally takes off the ground. What is the acceleration before the take off?
68. ## Physics

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

if 20g of steam at 100 c is mixed into 80 g of water at 20 c what is the final temperature if no heat lost
70. ## Physics

If a car engine has a power,P. Write an expression for the time it will take to accelerate from w to 4w. Note that P=wt where t is torque.
71. ## physics

a car of mass(m)800kg initially at rest is accelerated at rate of 4m/s calculate the k.e @ 5seconds
72. ## PHYSICS

TWO WEIGHTS ARE ATTACHED TO BOTH ENDS OF A WIRE AND SLIDED ON A BLOCK OF ICE.INVESTIGATE THIS PHENOMENON?
73. ## Physics

What is the formula to find magnetic field at the centre of the solenoid of hollow iron core??
74. ## 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
75. ## Physics

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

What is the partial pressure of water on a day when the temperature is 25C and the relative humidity is 33% P=___Pa
77. ## Physics - Magnetism

The direction of magnetic lines of force change if an iron piece is placed in its field. Why?
78. ## physics

How many times a minute does a boat bob up and down on ocean waves that have a wavelength of 43.0 m and a propagation speed of 5.25 m/s?
79. ## physics-magnetism

The direction of magnetic lines of force change if an iron piece is placed in its field. Why?
80. ## physics

What is the quantum particle of the electric field? Answer a. The proton. b. The electron. c. The photon. d. The neutron.
81. ## PHYSICS

A point source of a wave emits 195 watts. What is the intensity at a distance of 4.56 meters? I =
82. ## physics

a bus decreases its speed from 80kmh-1to 60kmh-1 in 5 sec find the acceleration
83. ## Physics

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

x-rays produced in an x ray machine can have a frequency of 1.4*10^14 what is the wave length of these electromagnetic waves in nm?
85. ## physics

a body is moving with uniform acceleration of 10m/s2.if it starts from rest calculate its displacement after 5s
86. ## physics

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

how high a building can superman jump over if he is to leave the ground with a velocity of 60 m/s at an angle of 75 degrees
88. ## PHYSICS

AN OBJECT MASS OF 10KG IS PLACED ON AN INCLINED PLANE AT 30 degree at the horizontal calculate recreation between two su
89. ## AP Physics B

What is the force of Friction as a 12 kg object slides down for 30 meters down a 30 degrees incline at a constant velocity?
90. ## physics

Find the voltage increase when 12 J of work is done to push a 0.0013 C charge into an electric field.
91. ## physics

Why does a conductor carrying current experiences force when held in a magnetic field at right angles to it?
92. ## physics

A women walks 2m in the direction 60degrees north of east. find her final displacement.
93. ## physics

A women walks 2m in the direction 60degrees north of east. find her final displacement.
94. ## physics

How much centripetal force is needed to keep a 0.20 kg ball on a 1.50 m string moving in a circular path with a speed of 3.0 m/s?
95. ## physics

an airplane taking off from a landing field has a run of 500m. Calculate the average acceleration in ft/s2.
96. ## physics

Write the equation for fill factor in terms of V_max, V_oc, J_max, and J_sc. FF =
97. ## physics

How much centripetal force is needed to keep a 0.20 kg ball on a 1.50 m string moving in a circular path with a speed of 3.0 m/s?
98. ## Physics

What is the maximum total force exerted on a 78 kg astronaut by her seat during the launch of the Space Shuttle?
99. ## PHYSICS

a 3000 N car is moving at 12.0m/s comes to a stop while skidding a distance of 25.0m. what is the coefficient of kinetic friction?
100. ## Physics

all electric field lines start on positive charges. explain why this makes sense.