Physics

a pen placed 13.2 cm from a concave spherical mirror produces a real image 14.0 cm from the mirror. a) what is the focal length of the mirror? answer in units of cm.
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example 16-3: sound intensity on the street. at a busy street corner, the sound level is 75 db. what is the intensity of sound there?
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given two identical iron bars, one of which is a permanent magnet and the other unmagnetized, how could you tell which is which by using only the two bars?
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A wheel of radius R starts from rest and accelerates with a constant angular acceleration about a fixed axis.At what time t will the centripetal and tangential accelerations of a point on the rim have the same magnitude?Express your answer in terms of the given quantities.
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g what is the relationship between the wavelength of light, its color, and the energy of its photons?
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a ball is thrown upward from the ground with an initial speed of 35 m/s; at the same instant, another ball is dropped from a building 5.0 m high. after how long will the balls be at the same height?
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I need help with this1)Hypothesis: what you expect 2)Aim:To determine3) Apparatus/material4)Variables Controlled: Keep constant Manipulated-Change this Reporting -What you expect to change5) Expected results6) Limitations7)Source of errors8)Precaution
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how much tension must a rope withstand if it is used to accelerate a 1410- kg k g car horizontally along a frictionless surface at 1.40 m/s2 m / s 2 ?
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a flashlight bulb carries a current of 0.32 a for 82 s . part a how much charge flows through the bulb in this time?
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Which type of marco molecules help a cell break down food?
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how many electrons per second enter the positive end of the battery 2? answer in units of electrons/s.
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a 100 kg shot-putter pushes on a 4 kg shot with a force of 500 n forward and a force of 866 n upward. how large is the resultant force acting on the shot?
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what property of objects is best measured by their capacitance? what property of objects is best measured by their capacitance? the ability to conduct electric current the ability to distort an external electrostatic field the ability to store charge
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what kind of pressure prevents a white dwarf from collapsing?
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particle travels in a circle of radius 26 m at a constant speed of 14 m/s. what is the magnitude of the acceleration (in m/s2)?
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a body weighs 0.5kg in air 0.3kg in water and 0.2kg in a liquid. what is the relative density of the liquid
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s of nuclei and consists of two protons and two neutrons. the particle has a charge of q 2e and a mass of 4.00 u, where u is the atomic mass unit, with 1 u 1.661 1027 kg. suppose an alpha particle travels in a circular path of radius 4.50 cm in a uniform magnetic field with b 1.20 t. calculate (a) its speed, (b) its period of revolution, (c) its kinetic energy, and (d) the potential difference through which it would have to be accelerated to achieve this energy
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if the absorbance for a sample is large, then the intensity of light as it passes through the sample will
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We were just introduced to electricity in physics and I have some questions:1. Since electrons can be transferred from our hair to the balloon, can electrons also be transferred from the balloon to our hair? (Do questions always say whether an object is positive or negative charge)2. Do electrons stay in place since balloons are rubber insulators?3. What point do neutrons serve? Are they just there?4. Are objects in constant exchange of energy with one another? Whenever they come in contact they exchange electrons until equal?
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how do extrusive igneous rocks form
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if a tesla model s p100d in "ludicrous mode" is pushed to its limit, the first 3.0 s of acceleration can be modeled as
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when resistors are connected in series, select one: a. the current flowing in each is the same. b. more than one of the given answers is true. c. the potential difference across each is the same. d. the same power is dissipated in each one.
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you are holding a box of books with flat hands. if you press harder, what happens to the friction force applied by your hands onto the sides of the box?
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suppose the polar ice caps melted sending water towards the equator and increasing the moment of inertia of the earth by 1.1. the angular velocity of the earth will be
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