# Math/Physics

214,413 results, page 70

1. ### Physics

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.
2. ### physics

A trolley while going down an inclined plane has an acceleration of 2 cm/s2.What will be the velocity 3 secs after its start?
3. ### 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?
4. ### Intro to Physics

With scanning probe microscopy technology, we see not actual atoms but rather images of them. Explain.
5. ### 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
6. ### physics

A boy sledding down a hill accelerates at 1.20 m/s2. If he started from rest, in what distance would he reach a speed of 7.00 m/s?
7. ### physics

A boy sledding down a hill accelerates at 1.20 m/s2. If he started from rest, in what distance would he reach a speed of 7.00 m/s?
8. ### Physics

A boy sledding down a hill accelerates at 1.55 m/s2. If he started from rest, in what distance would he reach a speed of 6.90 m/s?
9. ### physics

if a ball is tossed from ground level upward at a speed of 44 m/s how long will it take to reach its maximum height
10. ### physics

A car comes to rest uniform deceleration at the rate of 5.8 m/s2 for 14.3 seconds. What is distance did it travel during this time??
11. ### Physics

It takes you 10min to walk with an average velocity of 1.2m/s to the north from the bus stop to the restaurant entrance. What is your displacement?
12. ### Physics

How long does it take T-Rex to reach its food 200m away assuming that he starts from rest and accelerates at 4.00 m/s2?
13. ### Physics

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.
14. ### physics

if you are stuck in the middle of a frictionless frozen lake with only your backpack, how can you get back safely to solid ground?
15. ### physics

if you are stuck in the middle of a frictionless frozen lake with only your backpack, how can you get back safely to solid ground?
16. ### physics

if you are stuck in the middle of a frictionless frozen lake with only your backpack, how can you get back safely to solid ground?
17. ### Physics

Problem 3- If a bug can jump straight up to a height of 0.5 m. a) what is its initial speed as it leaves the ground? b) How long is it in the air?
18. ### physics

A 4.00kg kg bucket of water is accelerated upward by a cord of negligible mass whose breaking strength is 73.0N N .
19. ### physics

Forces of 9.93 N and 1.23 N act at right angles on a reddish-green block of mass 3.02 kg. How much acceleration occurs?
20. ### physics

What maximum height will a 318.3 m driver each if it is launched at an angle of 17.0 tothe ground? The acceleration due to gravityis 9.81 m/s2.
21. ### physics

A flower pot with a mass of 3.8kg is hanging by 2 wires that make an angle of 48° from the horizontal. what is the tension in each wire?
22. ### physics

A flower pot with a mass of 3.8kg is hanging by 2 wires that make an angle of 48° from the horizontal. what is the tension in each wire
23. ### physics

A merry-go-round makes 23 revolutions in a 2.8min ride. Part A What is its average angular speed in rad/s?
24. ### Physics

the 8kg mass of an object moves in a distance of radius 10cm at 15m^2.calculate the angular velocity
25. ### PHYSICS

What's the total mechanical energy of a 300kg satellite in circular orbit 1400km above Earth's surface?
26. ### Physics

How much force is needed to hold a nearly weightless but rigid 1-L carton beneath the surface of water?
27. ### physics

Find the distance by which a 42cm diameter, 9.4m tall concrete column is compressed when it supports a 12900kg load
28. ### physics

if a teacher wanted to demonstrate mass in the classroom, which of the following objects should she use? a ruler or an eraser
29. ### physics URGENT

3. Using conceptual meaning of g = Fg/m [N/kg], answer the following: a) What does the spring scale read on the surface of the Moon?
30. ### Physics

Why do some cooks put ice in the pot to cook meat? Explain then prove your answer by solution.
31. ### Physics

Why is an ice cube at 0°C more effective in cooling soft drink than the same mass of water at0°C?
32. ### Physics

Why do some cooks put ice in the pot to cook meat? Explain then prove your answer by solution?
33. ### Physics

A copper ball 2 cm in radius is heated in a furnace to 400 degree celsius. if its emissivity is 0.3, at what rate does it radiates?
34. ### PHYSICS

Name and discuss the levels of organization in a multicellular organism starting from the basic unit or structure of life.
35. ### physics

A 0.0400 kg ice cube at -30.0°C is placed in 0.400 kg of 35.0°C water in a very well insulated container. What is the final temperature?
36. ### Physics

Consider the static equilibrium diagram below. What is the net force acting along the positive x-axis?
37. ### physics

An 87.0 kg fullback moving east with a speed of 5.0 m/s is tackled by a 83.0 kg opponent running west at 2.92 m/s, and the collision is perfectly inelastic.
38. ### Physics

suppose you have 3 resistors, each of value 0f 30 omega. List all the different resistances that you can obtain by combining them
39. ### Physics

Another pendulum swings to and fro at a regular rate of two times per second. Show that its period is 0.5 s.
40. ### physics

Eight charges (50μC each) are arranged on the corners of a cube side length 1 cm. What is the magnitude of the force on each charge in Newtons?
41. ### PHYSICS(HELP)

Eight charges (50μC each) are arranged on the corners of a cube side length 1 cm. What is the magnitude of the force on each charge in Newtons?
42. ### Physics

If a current is flowing with a value of 5.9 A, how much electron charge passes any single point in 25 seconds? A) 1.9 x 1020 e

44. ### Physics

An object is dropped from a platform100 ft high. Ignoring wind resistance, how long will it take to reach the ground?
45. ### Physics

How much momentum does a .01 kg ping pong ball have if it is traveling at 25 miles/hour? (1.609km=1 mile)
46. ### Physics

How much momentum does a .01 kg ping pong ball have if it is traveling at 25 miles/hour? (1.609km=1 mile)
47. ### physics

Calculate the pressure exerted on the floor by the heel if it has an area of 1.45 cm2 and the woman's mass is 58.0 kg. Express the force in N/m2 and lb/in
48. ### physics

the work function of zinc is 3.6ev what is maximum enegy photoelectron by ultraviolet wave of light 3000angstrome
49. ### Physics

we have to transpose the following equation to find p, but I don't quite understand how to come up with the correct answer: x^2/p^2 + y^2/q^2 = 1 Appreciate help, thanks
50. ### physics

A.Use newtons first law to explain why whiplash occurs? B.why are cars fitted with head rests?
51. ### algebra based physics

Two protons in a nucleus are separated by 8.0×10−15m . What's the potential energy of the pair?
52. ### Physics

A 2473 kg elephant is walking at 3 m/s on a flat surface. How much kinetic energy does he have? Answer in Joules or J
53. ### Physics

A 2473 kg elephant is walking at 3 m/s on a flat surface. How much kinetic energy does he have? Answer in Joules
54. ### physics

What is the maximum acceleration a car can undergo if the coefficient of static friction between the tires and the ground is 0.24? a_{max} =
55. ### physics

Explain in terms of the conservation of momentum why the ratio of the masses of a bullet and a gun must be carefully considered
56. ### Physics

what type of heat transfer does solar hot water heating use? (conduction, convection, radiation)
57. ### Physics

A traffic light is hanging from two cables tilted at 37 and 42 degrees. If it has a mass of 2.3 kg find the tension in each cable.
58. ### physics

A stone of mass m kg is held h metres above the floor 50s.The workdone in joules over this period is
59. ### Physics

How much pressure is exerted on a submarine at a depth of 8.50 km in the Pacific Ocean? (density of sea water = 1.025 x 10^3 kg/m3, P0 = 1.01 x 10^5 Pa)
60. ### physics

How many excess electrons are there in a typical lightning bolt that has about 16 C of charge? Answer 1 x 1020 1 x 1019 10 1 x 1016
61. ### 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?
62. ### Physics

design a pair of ear defenders and explain how they work using big idea of energy transfer
63. ### physics

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.
64. ### physics

a man walks 8km North and then 5km in a. direction 60degrees. find its distance from his starting point
65. ### Physics

Q1:Find the phase and group velocities of the de Broglie waves of an electron whose kinetic energy is 500kev?
66. ### physics

Calculate the average velocity for a remote controlled vehicle that starts with a speed of 1.0 m/s [forward] and then accelerates at 0.08 m/s2 [backward] for 4.0 s.
67. ### physics

Calculate the average velocity for a remote controlled vehicle that starts with a speed of 1.0 m/s [forward] and then accelerates at 0.08 m/s2 [backward] for 4.0 s.
68. ### Physics

Can someone explain the magnitude and direction of the acceleration of a ball moving upward, downward,and at the highest point? a=g
69. ### PHYSICS

the following data were obtained for the position of a ball as it rolled along a straight track DISPLACEMENT (CM) TIME 2.90 0.60 7.40 2.10 11.00 3.30 22.70 7.20 31.10 10.00
70. ### PHYSICS

he following data were obtained for the position of a ball as it rolled along a straight track DISPLACEMENT (CM) 2.90 7.40 11.00 22.70 31.10 TIME 0.60 2.10 3.30 7.20 10.00
71. ### Basic Physics

I don't understand how to work this problem out: Find x-component of vector a ⃗ = (7.0m/s 2 , - y-direction) Please help
72. ### 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?
73. ### PHYSICS

a swimmer develops an average of 200 watts in a distance of 100m in 80 seconds. what is the force resistance in the water?
74. ### physics

an object is 25 cm from a concave mirror whose focal length is 50 cm where will the image be located how wil lthe solution be ?
75. ### physics

In a panic-stop, a car's brakes produced an acceleration of -8.0 m/s2 (or a deceleration of 8.0 m/s2). If you are traveling at 35 m/s, your speed after braking for 3.0 s will be
76. ### physics

a particuler moves along the sides AB,BC,CD of a square of side 25m with a speed of 15m/s. Its average velocity is?
77. ### Physics

A body travels from rest with acceleration 8m/s(squared)Find its velocity when it has covered a distance of 100 meter?
78. ### Honors Physics

Give some examples of applications that have resulted from work done by physicists on the exploration of space.
79. ### physics

Find the force when two poles to strength 100 and 90 cgs units are placed at a distance to 20 cm a part.
80. ### physics

power applied to a particle varies with times as p=3t^2-2t+1 Watt where t is in second. And the change in its kinetic energy b/w time t=2s t=4s
81. ### physics

A bus accelerates at 1.4 m/s2 from rest for 14 s. It then travels at constant speed for 23 s, after which it slows to a stop with an acceleration of magnitude 1.3 m/s2.
82. ### physics

A ball is thrown straight up with an initial speed of 60 m/s. How high does it go? Assume the accelera- tion of gravity is 10 m/s22
83. ### physics

A kangaroo jumps straight up to a vertical height of 1.19m, how long was it in the air before returning on earth
84. ### physics

A cauterizer, used to stop bleeding in surgery, puts out 2.30 mA at 14.0 kV. What is its power output? What is the resistance of the path?
85. ### physics

You're sailboarding at 6.1m/s when a wind gust hits, lasting 6.3s accelerating your board at 0.48m/s2 at a 35∘ to your original direction
86. ### physics

A baseball is thrown vertically upward with a speed of 17.8 m/s from a height of 1.11 m. How high does the ball rise from its original position?
87. ### physics

Two 2.5 kg physical science textbooks on a bookshelf are 0.25 m apart. What is the magnitude of the gravitational attraction between the books?
88. ### Physics

A loudspeaker emits energy equally in all directions at the rate of 1.75J/s. What is the intensity level at a distance of 15 m?
89. ### physics

compute the acceleration of a 1500-N block sliding down a 30 degrees incline. Assume friction is negligible
90. ### Physics

An FM radio station of frequency 107.7MHz puts out a signal of 50,000 W.How many photons/s are emitted?
91. ### Physics

An experimenter finds that no photo-electrons are emitted from tungsten unless the wavelength of light is less than 270nm.
92. ### Physics

An FM radio station of frequency 107.7MHz puts out a signal of 50,000W. How many photons/s are emitted?
93. ### Physics

An FM radio station of frequency 107.7MHz puts out a signal of 50,000W. How many photons/s are emitted?
94. ### Physics

A 20,000 kg vehicle is running at 80km/hr in a rotonda with a radius of curvature 25m compute for the centripetal force
95. ### Physics-Intro

Find the total force necessary to give a rocket of mass 25,000 slugs an acceleration of 28.0 ft/s2.
96. ### Physics

Forces of 9.5 N and 5.12 N act at right angles on a reddish-green block of mass 3.19 kg. How much acceleration occurs?
97. ### physics

Forces of 4.57 N and 4.74 N act at right angles on a reddish-green block of mass 5.76 kg. How much acceleration occurs?
98. ### physics

A particle of mass 10 kg is slowly lifted up to a height of 10 metre then calculate the workdone by external and gravity force ?
99. ### physics

Forces of 4.57 N and 4.74 N act at right angles on a reddish-green block of mass 5.76 kg. How much acceleration occurs?
100. ### physics

What force is necessary to keep a 2.00x10^3 car moving up a 15.0 degree incline at a constant velocity? (Mu=.200)