Physics

a long, straight wire carries a current of 8.60 a. an electron is traveling in the vicinity of the wire. at the instant when the electron is 4.50 cm from the wire and traveling at a speed of 6.00 * 104 m>s directly toward the wire, what are the magnitude and direction (relative to the direction of the current) of the force that the magnetic field of the current exerts on the electron?
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the time it takes a planet to complete one full orbital revolution is commonly known as its question 25 options: period frequency acceleration velocity
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once body density is determined as with hydrostatic weighing and air displacement plethysmography, percent body fat can be calculated using
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If you lift one load up one story, how much more work do you do lifting one load upthree stories?
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use the impulse-momentum theorem to find how long a falling object takes to increase its speed from 4.23 m/s to 10.47 m/s?
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when a knowledgeable amateur astronomer tells you that she has a 14-inch telescope, what does the number 14 refer to?
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10. a kangaroo is capable of jumping to 250 cm height. determine time taken in jump and takeoff speed of the kangaroo.
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at what angle is the first-order maximum for 450-nm wavelength blue light falling on double slits separated by 0.0500 mm?
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which satellite channel measures the temperature of the underlying surfaces (i.e., clouds, ocean, land)? group of answer choices visible infrared water vapor
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explain how apostivley charged object can be used to leave another metalic boject with a net negative charge
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find the tension in an elevator cable if the 1 500-kg elevator is descending with an acceleration of 2.8 m/s2, downward.
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skateboarder begins down a ramp at a speed of 1.0 m/s. after 3 seconds, her speed has increased to 4.0 m/s. calculate her acceleration
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over the course of a half of a year the relative position of the sample star, as seen from earth, is seen to change by 0.400''. what is the parallax angle (p) in this case?\
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two long conducting cylindrical shells are coaxial and have radii of 20 mm and 80 mm. the electric potential of the inner conductor, with respect to the outer conductor, is 600 v. what is the maximum electric field magnitude between the cylinders? ( k
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each resistor is rated at 0.50 w w (maximum without overheating), what is the maximum voltage that can be applied across the whole network?
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Which segment of copper wire has the highest resistance at roomtemperature?(1) 1.0 m length, 1.0 10-6 m cross-sectional area(2) 2.0 m length, 1.0 10-6 m cross-sectional area(3) 1.0 m length, 3.0 x 10-6 m cross-sectional area(4) 2.0 m length, 3.0 x 10-6 m cross-sectional area
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a projectile is launched over a horizontal surface in such a manner that its maximum height is 4/5 of its horizontal range. determine the launch angle.
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a certain truck has twice the mass of a car. both are moving at the same speed. if the kinetic energy of the truck is k, what is the kinetic energy of the car?
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(a) Find the frequency ratio between the two frequencies fi =256 Hz and f2 = 320 Hz. (b) Add the interval of a fifth to f2 to obtain fs, and find the frequency ratio fs/fi. (c) Find the frequency of f3.
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speed camera uses electromagnetic radiation, with a wavelength 26 mm, to identify cars moving at 60 km/h or faster away from the camera. the cars act as the use of radiation, reflecting the radiation from the camera. what range of frequency decrease identifies cars above the speed limit?
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a standing wave experiment is performed to determine the speed of waves in a rope. the rope makes 36 complete vibrational cycles in exactly one minute. if the wavelength is 3 m, what is the speed (in m/s) of the wave?
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mountain bike tires have large, knob-like treads. these tires are useful on steep slopes because they responses increase friction. increase friction. carry heavy weights. carry heavy weights. increase the stopping distance. increase the stopping distance. prevent braking of the bicycle.
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a box is given a push so that it slides across the floor. how far will it go, given that the coefficient of kinetic friction is 0.11 and the push imparts an initial speed of 3.8 m/s ?
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Which of the following does a scientist NOT need to calculate the age of something?Amount of radioactive isotope within a sampleHalf-life of radioactive isotopeAbundance on Earth100g of the sample
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