physics please HELP !

74,641 results, page 89

  1. physics

    A battery of emf and negligible internal resistance is connected to two resistances R1 and R2 in series. What is the potential difference across R2?(a)E(R1+R2)/R2(b)E(R1+R2)/R1(c)ER2/R1+R2(d)ER1/R1+R2
  2. Physics

    two equal charges exert an elecrtric force on each other of 0.0385N when positioned 0.15m apart determine the magnitude of the charge on each point.
  3. Physics check

    According to Bohr, an electron in an excited state could give off ..... a continuous cascade of photons for a high-level transition.
  4. physics

    What's the shortest air column , closed at one end, that will resonate at a frequency of 440.0Hz when the speed of sound is 352 m/s
  5. Physics

    What is the wavelength of a radar signal that has a frequency of 30 GHz? The speed of light is 3 × 10^8 m/s. Answer in units of m Giving me the formula is just fine
  6. physics

    race car travels on racetrack at 38m/s and slowa at a constant rate of 20m/s over 10s how far does it move during this time
  7. pre ap physics

    what is the force excerted on the surface of a bowling ball that has a diameter of 32cm immersed in water to a depth of 555m?
  8. physics

    A basketball is thrown at 45° to the horizontal. The hoop is located 4.5m away horizontally at a height of 1m above the point of release. What is the required initial speed?
  9. Physics

    Calculate the height through which a crane can lift a load of 4 ton when it's motor of 4 H.P operates for 10 sec. Acceleration due to gravity is 10 m/s2
  10. physics

    What net torque is required to give a uniform 12-kg solid ball with a radius of 0.22m an angular acceleration of 12rad/s2 ?
  11. physics

    A 1100 kg car accelerates from rest to 27 m/s in 6.0 seconds. Neglecting friction, hat is the average power consumption in horsepower?
  12. physics 101

    a converging lens has a focal length of 10.0 cm. find the location of the image for object distances of a) 40.0cm b) the magnification
  13. physics

    If a ball is thrown vertically upward with initial velocity of 8 meters per second, what would the speed be when it returns to the starting point with acceleration of 9.81?
  14. physics

    An iron vise falls from rest at a great height. Neglecting air resistance, what is its speed after it has fallen for 5 seconds?

    An object is projected horizontally on a floor at 100ft/s. It then decceledates at 10ft/s2. After 5sec what are a.the speed of the body b. The distance it traversed
  16. Physics

    A 400 kg rocket sled can be accelerated at a constant rate from rest to 1600 km/h in 2.0 s. What is the magnitude of the required net force?
  17. Physics

    Calculate the work required to pull a wagon along a horizontal road for 4.0x10^2 m at a constant speed of 3.0 m/s if the force of friction is 8.0 N.
  18. Physics - Help!!!

    I want to be sure I'm using the right formula for this question: Calculate the electric force between 2 electrons that are 5.3 x 10^-11 m apart (electron charge = -1.6 x 10^-19 C) I'm using the equation for Coulomb's Law: F = K (q1 q2)/d^2 (-1.6 x 10^-19)(-1.6 x 10^-19) / 5.3 ...
  19. physics

    when preparing to undergo an MRI scan, why are patients advised to remove eyeglasses, watches, jewelry, and other metal objects?
  20. Physics- science

    An automobile with an initial speed of 4.82 m/s accelerates uniformly at the rate of 2.2 m/s2. Find the displacement of the car after 5.9 s. Answer in units of m
  21. physics

    Mrs bautista accelerates her bicycle uniformly along a straight path from 10.5 m/s to rest in 5.2s. A. What is her acceleration? B. What is her displacement during this time interval?
  22. physics

    a certain centrifuge produce a centripetal acceleration of magnigtude exactly 1410g at a point 12.3 cm from the axis of rotation. find the number of revolutions per second
  23. physics...damon please help

    Thirty microcoulombs of NEGATIVE charge experiences an electrostatic force of 27. mN. What is the magnitude and direction of the electric field?
  24. Physics

    A 250kg car initially at rest was travelling with acceleration of 10m/s square. Calculate the kinetic energy after 3 seconds
  25. physics

    Two forces are applied to a car in an effort to move it, as shown in the following figure, where F1 = 416 N and F2 = 363 N. (Assume up and to the right as positive directions.)
  26. Physics

    A car of mass is 100 kg applies break from 40 km per hours to 0 .it takes 12 seconds .what amount of force is applied for breaks?
  27. physics

    a plank will break if a forces of 350 N is applied to its center.What is the largest weight it can support if it is titled to an angle of 35degrees?
  28. physics

    If 2.00 multiplied by 1020 electrons move through a pocket calculator during a full day's operation, how many coulombs of charge moved through it?
  29. physics

    a string of cross section 2 cm^2 is doubled in length by the application of a longitudinal force 2*10^5dynes.the young"s modulus is: 1.10^5 dyne/cm^2
  30. Physics

    An austronaut orbits the Earth in the space shuttle, in one complete orbit, is the magnitude of thr displacement the same as the distance traveled?
  31. Physics

    Three identical charges of 2.0 uC are placed at the vertices of an equilateral triangle, 0.15m on a side. Find the net force acting on each angle.
  32. physics

    A 4.5 kg object is accelerated from rest to a speed of 39.2 m/s in 76 s. What average force was exerted on the ob- ject during this period of acceleration? Answer in units of N
  33. Physics

    How large must the coefficient of static friction be between the tires and the road if a car is to round a level curve of radius 85 m at a speed of 95 km/h?
  34. physics

    Tony£¬a 110kg football player£¬has a fever of 39celcius. What mass of water must evaporate from his body to cool him to 37celcius£¿
  35. physics

    use a scale diagram to determine: 1.the image distance 2.magnification for an object placed 1cm in front of a convex lens of 10cm
  36. physics

    The coefficient of kinetic friction for a 22 kg bobsled on a track is 0.20. What force is required to push it down a 6.0° incline and achieve a speed of 64 km/h at the end of 75 m?
  37. physics

    A car traveling at 91.0 km/h approaches the turnoff for a restaurant 30.0 m ahead. If the driver slams on the brakes with an acceleration of -6.40 m/s^2, what will her stopping distance be?
  38. Physics

    A regulation baseball has mass 145 g and diameter 22.86 cm. Will this ball float or sink in water? Vsphere = € 4 3π⋅r3
  39. physics

    A 20kg mass moving at a speed of 3m/s is stopped by a constant force of 15N. Show that the stopping time required is 4s.
  40. Physics

    I have a quick question, If a ballplayer catches a ball 3.0s after throwing it vertically upward. With what speed did he throw it, and what height did it reach?
  41. Physics

    While rearranging a dorm room, a student does 312 J of work in moving a desk 2.0 m. What was the magnitude of the applied horizontal force?
  42. physics

    an electric heater with a resistance of 40 requires 220v across its terminals. a,what is the power dissipated in the resistor b,how much heat is transferred in 1hour

  44. physics

  45. Physics

    The slab of steel shown below is being lifted at 0.50 m/s. It weighs 1.91×103N. If the angle θ equals 61.4 degrees, what is the tension in each cable?
  46. Physics Honors

    The same rock is thrown upwards at an angle of 45 degrees. It travels 10 meters up to its maximum height. How far will it travel before it lands?
  47. physics

    A certain centrifuge produces a centripetal acceleration of magnitude exactly 1090g at a point 12.3 cm from the axis of rotation. Find the number of revolutions per second.
  48. physics

    How much work in eV is required to bring three charges of 5.4x10-19C from a great distance apart to 3.76x10-8m from one another (at the corners of an equilateral triangle)?
  49. physics

    A basketball is thrown at 45° to the horizontal. The hoop is located 4.4 m away horizontally at a height of 1.1 m above the point of release. What is the required initial speed?
  50. physics

    How much work in eV is required to bring three charges of 6.8x10-18C from a great distance apart to 5.04x10-9m from one another (at the corners of an equilateral triangle)?
  51. physics

    A ball is thrown straight up and reaches a maximum height of 7.16 m. What was its initial speed? The acceleration of gravity is 9.8 m/s Answer in units of m/s.
  52. Math, physics, chemistry

    calculate total ionic strength of solution in which concentration of CuSO4 and Al2(SO4)3 is 0.1 molar
  53. Physics

    Suppose that a disk rotates through two revolutions in 5.5 seconds. (a) What is its displacement in radians in this time? (b) What is its average rotational velocity in rad/s?
  54. Physics

    A 3.0 kg block slides down a 4.5 m ramp of angle 30 degrees and collides inelastically with a 4.5 kg bolck at rest. Calculate the velocity after the collision.
  55. Physics

    When a body slides along an inclined plane of height 'h' and describes a vertical circle of radius r on reaching the bottom Ans:h =5R/2
  56. physics

    a car is pushed along at 2.50 times 10^3 kg from rest creating 5000 joules of work. It moves 25 meters. what is the horizontal force ?
  57. Physics

    What average force is needed to accelerate a 8.00-gram pellet from rest to 135 m/s over a distance of 0.800 m along the barrel of a rifle?
  58. physics

    How fast a Ford Focus car weighing 1200 kg should be moving to have the same momentum as the bullet? Express your answer in miles/hr.

    A Hammer weighing 3kg strikes the head of a nail with a speed of 2m/s and drives it by 1cm into the wall. find the impulse?
  60. physics

    Use these magnitudes of the forces of gravity at Earth's surface to determine the masses of the objects on which they act A)0.98N. B)62N C)44.5MN
  61. physics

    Use these magnitudes of the forces of gravity at Earth's surface to determine the masses of the objects on which they act A)0.98N. B)62N C)44.5MN
  62. physics

    Explain why it would not make sense to use a full-size glass thermometer to measure the temperature of a thimbleful of hot water?
  63. physics

    a 35.5kg box slides down an incline plane with a 25 degree angle at a constant rate. how do i calculate the coefficient of friction
  64. physics

    a motorisrt accelerates their car to 36m/s before realising they are over the speed limit and decelerates to 32m/s. calculate the distance traveled
  65. physics

    what kind of information is indicted by a graph of the acceleration due to gravity versus ball's mass if the slope of the curve is zero?
  66. physics

    A snowboarder of mass 71.8 kg (including gear and clothing), starting with a speed of 4.8 m/s, slides down a slope at an angle θ = 37.1° with the horizontal.
  67. physics

    A proton with a kinetic energy of 5.00E-16 J moves perpendicular to a magnetic field of 0.289 T. What is the radius of its circular path?
  68. physics

    an object falls directly from a plane flying horizontally at an altitude of 10000ft at 50mi/h. how long will it take to hit the ground?
  69. Physics 1

    What is the minimum speed that a roller coaster must have so that the people do not fall out at the top of the circle in an upside down loop? Take the radius to be 8 meters.
  70. Physics

    Why does the blood of deep sea divers look greenish-black in underwater photographs taken with natural light, but red when flashbulbs are used?
  71. Physics

    A projectile is fired straight up at a speed of 16 m/s. How long does it take to reach the top of its motion? The acceleration of gravity is 9.8 m/s2 . Answer in units of s.
  72. Physics

    You are testing a car on the Nevada salt flats traveling 85 m/s. Your parachute deploys and you decelerate at 13 m/s^2. How long does it take to come to a complete stop?
  73. Physics

    Convert 341 m/s into km/h. (I have to leave the final answer to the correct number of digits according to the certainty rule for multiplying and dividing)
  74. physics

    Two small metal spheres with masses 2.0 and 4.0 are tied together by a 5.4--long massless string and are at rest on a frictionless surface. Each is charged to +2.4 .
  75. physics help

    A flywheel turns through 32 rev as it slows from an angular speed of 2.1 rad/s to a stop. How much time is required for it to complete the first 16 of the 32 revolutions?
  76. Science (Physics)

    Two 1.5 kg balls move away from each other, one traveling 9 m/s to the right, the other 2 m/s to the left. What is the magnitude of the total momen- tum of the system? Answer in units of kg · m/s
  77. physics

    How far to the nearest tenth of a meter can a runner running at 15 m/s run in the time it takes a rock to fall from rest 76 meters?
  78. physics

    Given. a = 25.1 cm and b = 51.2 cm and the forces are F1 = 10.3 N, F2 = 10.6 N and F3 = 14.7 N. The angle between F2 and the horizontal is θ = 27.9 °. Find the magnitude of the net torque on the wheel about the axle through O. Answer in units of N m.
  79. Physics

    The power output of an elevator is 15000 W. How many persons could it carry if it raises passenger to a height of 35 m in 20 s ( each person has an average mass of 60 kg)?
  80. physics

    1. During storm roof of house is blown off 2.It is dangerous to stand near the railway track when a train is moving with high speed
  81. Physics

    How fast (in rpm) must a centrifuge rotate if a particle 69-cm from the axis of rotation is to experience an acceleration of 200438 g's? (can you show me how you get the answer) be thorough
  82. physics

    An 75 kg quarterback jumps straight up in the air right before throwing a 0.43 kg football horizontally at 11 m/s. How fast will he be moving backward just after releasing the ball?
  83. Physics

    A projectile is launched at an angle of 6.0 degrees above the horizontal. Which component of the velocity vector remains the same during the flight (neglecting friction).
  84. 6th grade science (physics)

    explain and describe Law of Universal Gravitation in relation to force, mass and distance
  85. Physics

    Ajuggler throws a ball from height of 0.950 m with an overall velocity of =4.25 m/s, 67 degrees above horizontal and misses it on the way down. What is the overall speed when it hits the ground?
  86. physics

    Four 7.5 kg spheres are located at the corners of a square of side 0.60 m. Calculate the magnitude and direction of the gravitational force on one sphere due to the other three.
  87. Physics

    Calculate the potential energy of a 40 gram sparrow resting on a branch 30 feet above the ground. (Hint: 1 foot = 0.305 m)
  88. Physics

    A body's temperature is increased from 900K to 1900K. By what factor does the total power radiated per unit area increase?
  89. Physics

    1. A 2,000 kilogram truck traveling at 60km/h strikes a tree and stops in 0.75 seconds. How large is the force that causes this to occur?
  90. Physics

    two small spheres lie 1.5 meters apart and carry identical charges. How large is the charge on each if a sphere experiences a force of 2.0 N.
  91. Physics

    A car of mass 1000kg starting from rest and comes down an incline slope if it travel 300m in 30 second calculate i) acceleration ii) force
  92. physics

    a monatomic gas initially at 19 degree celsius is suddenly compressed to 1/10th its original volume .what is temperature after compression?
  93. physics

    A crate of mass m = 230 kg is pushed at constant speed up the frictionless ramp (θ = 29.0°) by a horizontal force F. What is the magnitude of F?
  94. physics

    A 912 kg drag race car accelerates from rest to 108 km/h in 0.795 s. What change in momentum does the force produce?
  95. Physics

    3000 Joules of energy in the form of heat are added to a copper block with a mass of 1 kg. What is the blocks temperature change?
  96. PHYSICS: Waves in Media

    An organ pipe is open at one end and has a length of 3 m. What is its fundamental frequency if the speed of sound is 336 m/s?
  97. physics

    what do you mean by conservative forces?An elevator weighing 400 kg is to lifted up at a constant velocity of 3cm s-1,what would be the minimum power of the motor to be used?
  98. Physics(Please help)

    Determine the final speed assuming that the time elapsed since t=0 is 2.4s. Initial velocity is +12m/s acceleration is +3.4m/s^2 I tryed doing 12/2.4 and then 12/3.4 but both of these were incorrect? I am not sure what to do. Thank you.
  99. physics

    If the coefficient of kinetic friction is 0.25 , how much horizontal force is needed to pull each of the following masses along a rough desk at a constant speed? A) 25 kg
  100. physics

    consider the loop in the figure. The area=600m, and it spins with angular velocity =40.0 rad/s in a magnetic field of strnght B=.400 T
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