# Physics!

74,459 results, page 45

1. ### Physics

Describe the acceleration time graph of a car traveling forward and applying its brakes.
2. ### Physics

How does the conservation of mechanical energy explain why a planet in an elliptical orbit changes speed?
3. ### physics

A 1300 kg sports car accelerates from rest to 90 km/h in 7.0 s. What is the average power delivered by the engine?
4. ### PHYSICS

A race car's velocity increases from 3.6 m/s to 32.4 m/s over a 5-s time interval. What is its average acceleration?
5. ### Physics

At a spot in the ocean, the surface irradiance is 7.8*10^16 photons and k=.14 m^-1. At what depth does the euphotic zone end?
6. ### Physics

What's the tangential acceleration of a freely swinging pendulum when it makes an angle θ with the vertical?
7. ### physics

How much energy is produced when the sun converts one kg of hydrogen into helium?
8. ### SCIENCE

Didn't mean to ask but i was really curious and didn't get an answer from researching.Why is physics necessary in becoming a dentist?
9. ### physics

Good job "Drwls", your answer to my bowling ball question worked. Way to go!
10. ### physics

What is the frequency of the microwaves in a microwave oven? The wavelength is 12 cm. I have to give the answer in GHz
11. ### 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
12. ### Physics/ optics

An object is located 25cm in front of a +6.00 lens, where is the image? is it real or virtual?
13. ### Physics

In a hydrogen atom, if the radius of the orbit of the electron is doubled, then its energy will ... >> Increase by a factor of 2??
14. ### physics

pls what is the formula for calculating period given gravity, mass and length of the material
15. ### Physics

What is the difference in blood pressure between the head and feet of a person of height 171 cm?
16. ### PHYSICS

If the current in a 100 mH coil changes steadily from 25.0 A to 10.0 A in 375 ms, what is the magnitude of the induced emf?
17. ### PHYSICS

What is the inductance L of a 0.40 m long air-filled coil 3.2 cm in diameter containing 10,000 loops?
18. ### physics

what is the most important element for creating a magnetic field. and why? Moving charges..... right?
19. ### physics

do all electrons ejected from a metal surface have the same kinetic energy?
20. ### physics

How much work must be done to increase the speed of an electron from 0.200c to 0.210c? In (MeV)
21. ### Physics

How many electrons must be removed from an electrically neutral silver dollar to give it a charge of +2.0 ìC?
22. ### physics

if the piston is in thermal equilibrium but the it is pushed inward, can there be a change in temperature(increase) even if Q=o
23. ### 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?
24. ### physics

Hi, How can you charge an electroscope negatively? Is it by using a positively charged rod? Can someone please help me? Thank you :)
25. ### physics

Suppose a rock fell off a cliff. After 5 seconds, its speed well be 100 m/s
26. ### 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?
27. ### physics

A constant net force of 1500 N gives a toy rocket an acceleration of 2.5 m/s2. what is the mass in kg?
28. ### Physics

If a tuning fork puts out a tone at 440 Hz, what is its wavelength in air at 25 degrees?
29. ### Physics

If a tuning fork puts out a tone at 440 Hz, what is its wavelength in air at 25 degrees?
30. ### physics

An automobile driver puts on the brakes and decelerates from 30.0 m/s to zero in 15.0 s. What distance does the car travel?
31. ### Physics

a runner moving at a speed of 5.60 m/s rounds a curved track with a 60.0 m radius. what is the runners acceleration?
32. ### physics

A plastic bobber just barely floats in water. If it weighs 2N in the air, what is its volume
33. ### Physics

While riding her bicycle, she goes from a full stop to 9m/s in 3 minutes. How fast is she acclerating?
34. ### physics

please shelp me with this problem what is the stopping potential (V) if the wavelength of the incident light is 400 nm??
35. ### Physics

if you push a wall with a force of 50N, the work you do is...... (a)500J (b)5000J (c)50J (d)zero
36. ### physics

how high must a 2 kg basketball be thrown so that the top of its arc, it has a potential energy of 160J?
37. ### physics

The space shuttle traves in orbit at 210000 km/hr. How far will it travel after 5.0 hrs?
38. ### physics

if you jump upward with a speed of 2mls, how long will it take before you stop rising?
39. ### College Physics

What is the work required to move a proton 1 cm along the 7 volt equipotential line?
40. ### physics

In the ideal case of zero resistance, a ball rolling on a level surface will accelerate
41. ### Physics

Absolute temperature is proportional to the average kinetic energy of the atoms. True or false?
42. ### physics

A car travels in a straight line for 4.5 h at a constant speed of 61 km/h . What is its acceleration? Answer in units of m/s2.
43. ### physics

By how much does the speed of a vehicle moving in a straight line change each second when it is accelerating at 4 m/s2?
44. ### physics

8. Before you drop a ball held at a height of 5m with a weight of 20 N, what is its gravitational potential energy
45. ### physics

Is it possible for a frictional force to increase the mechanical energy of a system? If so, give examples.
46. ### physics

what is the speed of a ball after it has fallen freely from rest through a distance of 12 meters
47. ### physics

a 10-kg bos slides down a frictionless ramp with acceleration 3.6 m/s calculate the weight anlge? f ?
48. ### physics

If a spring has a constant of 20N/m how much potential energy does it store if it is compressed 2m in joules? <3
49. ### physics

What average power is required for a runner with a mass of 80 kg to reach a speed of 8.2 m/s during a time of 1.8 s?
50. ### 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
51. ### 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?
52. ### Physics

Calculate the tangential speed of the earth around the sun (assuming a circular orbit).
53. ### Physics

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

a circuit contains a 9v battery and two 1 ohm bulbs. what is the voltage drop across each.
55. ### physics

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

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

does each of the two lenses used in a microscope produce a magnification of the object being viewed?
58. ### physics

calculate the impulse necessary to stop a 1500 kg car travelling at 90km/hour
59. ### Life...

Do i need to take precal and physics in highschool to become a nurse, dentist, or doctor?
60. ### physics

why does the filament of a bulb does not melt though it heats more than 3400 degree celcius
61. ### physics

--------------------------------------- A rugby player of mass 82kg is running at 6.0m/s. How much energy will be needed to stop him? ---------------------------------------
62. ### Physics

.17 kg hockey puck initial velocity 21 m/s stops 62m away. what is coefficient of friction?
63. ### physics

A rotating cylinder about 16 long and 6.2 in diameter what angular speed must it rotate?
64. ### physics

A hunk of cast concrete with a weight of 10 N will float if it displaces 10 N of water. True or False
65. ### PHYSICS

Calculate the radial acceleration of an object on the ground at the earth's equator in m/s2, turning with the planet.
66. ### physics

at time t=0 the driver starts to brae determine how long the bus takes to stop
67. ### Physics

Calculate the radial acceleration of an object on the ground at the earth's equator in m/s2, turning with the planet.
68. ### Physics

What is the force necessary to accelerate an object with a mass of 115 kg and and an acceleration of 6 m/s2 (squared) east?
69. ### physics

which object will have higher inertia a rock of 20kg or a hollow ball of 22kg
70. ### physics

A yo-yo of radius 10 cm and mass 1 kg is dropped from rest. What is the instantaneous torque on the yo-yo if I hold the string with my fingers?
71. ### physics

i have two kinetic energies and my homework asks for the ratio, K2/K1 Do i just divide them?

A long jumper jumps with the initial velocity of 12.0 m/s at an angle of 20 degrees. what is the displacement of x?
73. ### physics

YOU PUSH A REFRIGERATOR WIT HA FORCE OF 50N AND IT MOVES 3 METERS ACROSS THE FLOOR
74. ### physics

A force of 3000 N is applied to a 1500-kg car at rest. (a) what is its acceleration? (b) what will its velocity be 5 s later?
75. ### physics

How would the use of dark matter affect the earth and universe? Explain possiblities
76. ### physics

A ball is thrown vertically upward with a speed of 27.6 m/s. How high does it rise? Answer in units of m.
77. ### Physics

As the temperature of an object becomes higher, what happens to the average wavelength of the radiation it emits?
78. ### Physics

does a baseball thrown at 100 miles per hour have a lot of force?
79. ### physics

find the force of a toy jeep if the mass is 50kg and is traveling at 4 m/s and the radius is 50 centimeter
80. ### physics

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

a ball moves with a constant speed of 4 m/s around a circle of radius 0.25 m. what is the period of the motion?
82. ### physics

A projectile is launched straight upwards at 45 m/s. Three seconds later, its velocity is A. 75 m/s B. 30 m/s C. 15 m/s D. zero
83. ### physics

How high must a 2.0-kg basketball be thrown so that the top of its arc, it has a potential energy of 160 J?
84. ### PHYSICS!!!

By how many decibels does the sound intensity from a point source decrease if you increase the distance to it by a factor 6?
85. ### physics

how much work is being done if a 100 N box is lifted 3 meters off the ground???
86. ### Physics

If a clock says 10:30 am and the second hand rotates 960 degrees what time would it be?
87. ### physics

the period of revolution of a satellite is 90 min. Find the radius of the orbit assuming an acceleration of 9.8 m/s/s.
88. ### physics

Describe how the energy from a rotating flywheel can be transferred to moving parts of a child's toy.
89. ### physics

explain examples of physical laws used during the Apollo 13 mission to get it home
90. ### physics

a mass 3 kg is dropped from a 20m high stand how long does it take to reach the ground?
91. ### physics

a mass 3 kg is dropped from a 20m high stand how long does it take to reach the ground?
92. ### Physics

How much force is needed to make a 1,400 kg car moving at 35 m/s come to a stop in 5.2s?
93. ### Physics

How much force is needed to make a 1,400 kg car moving at 35 m/s come to a stop in 5.2s?
94. ### physics

How can I calculate exactly where a marble will drop if it is rolling of a table with very little friction??
95. ### physics

the frequency of yellow lights is 5.00 x 10^14 Hz. if it travels through space (where v= 3.00 x 10^8m/s) find the wavelength of this light.
96. ### physics

if a man weighing 80 kg falls from 20000 feet , what would be his weght when he hits the ground?
97. ### physics

a 150g-iron ball at 95 Celsius is dropped into a cavity in a block of ice
98. ### Physics 112

Two point charges, +3.18 µC and -6.40 µC, are separated by 1.32 m. What is the electric potential midway between them?
99. ### science (physics)

thank you for your help! my question is :how do you find the magnitude of the electric field that will balance the weight of an electron?
100. ### physics

A 7.9 kg object undergoes an acceleration of 2 m/s2. What is the magnitude of the resultant force acting on it? Answer in units of N.