Physics

A fisherman uses sonar to find a shoal of fish. A pulse of ultrasound is sent out and the reflection is detected 0. 4 seconds later. How long did it take the sound to travel from the boat to the fish?
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The author says this is equivalent to taking a long shower every day for two-and- a half weeks to
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A spinning disk with a mass of 12 kg and a radius of 2 m has an angular velocity of 3 rad/s. What is the kinetic energy of the disk?
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Assuming birdman flies at a speed of 37m/s,how high should birdman fly to hit the bucket if the bucket is placed 118m from the start of the field
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Questions 1 Describe how radio telescopes are used to explore space. 2. How are radio waves used on Earth? 3. Why do radio telescopes convert radio waves (analog signals) to electrical (digital) signals for analysis? (Hint: What did the article say about the advantages of digital signals?)
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Laboratory worksheetin this activity you will use the virtual laboratory to create an electromagnet to pick up paperclips. notice that there are many variables to test in this lab. there is a power supply, a core for the wire to wrap around, different types of wire, and different gauges or thicknesses of wire. the voltage can also be adjusted. for each trial, choose one variable to change. pre-lab questions:explain what it means when we say a substance is magnetic. discuss the relationship between electric and magnetic fields. what type of metals are known as ferromagnetic metals?open the lab interactive and run a few trials changing the variables each time. decide which variable you want to change in order to make a strong electromagnet, and record it here. this will be your independent variable. hypothesisrecord your hypothesis as an "if, then" statement. (if the independent variable does this, then the dependent variable will do that. )variableslist the independent (test variable), dependent (outcome variable), and controlled variables. be sure to change just one variable for each trial. procedureuse the virtual laboratory to create an electromagnet, changing only your independent variable. record the data and what each variable was set at for each trial. record the number of paper clips the electromagnet picked up for each trial (this is the dependent variable and reflects the strength of the electromagnet). repeat your trial three times. you should vary only the independent variable you chose. datarecord your data for each trial. be sure to change just one variable at time. this will allow you to see which variables will affect the number of paper clips collected. trial size of wire gauge material of wire voltage number of winds resulting paper clips picked uptrial 1 trial 2 trial 3 post-lab questionsreview your data. did your experiment support your hypothesis? explain your answer. what role does voltage play in the formation or use of an electromagnet?if you were able to keep the electromagnet that you created in your laboratory activity, what would be two possible uses for the electromagnet?what is an advantage of using an electromagnet rather than a regular magnet?
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are physical quantities and fundamental quantities same
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If five equal resistors dissipate a total of 10 W in a series circuit, how much power does each resistor dissipate
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2. Suppose the sled runs on packed snow. The coefficient of friction is now only 0.12. A person and sled weighing 650 N sits on the sled and it is pulled at a constant velocity across the snow.A. Draw FBD.B. What is the combined mass of the sled and person?C. Determine the frictional force value.D. What is the value of the force needed to pull the sled?
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Radar; atomic & molecular research, microwave ovens, cell phones are possible because of which type of wave? Pic attached below
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Hi, can someone pls help me solve this. Its physics and the topic is electrostatics Thanks
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All of the following are active listening skills and intercultural communication skills used in the classroom except:Asking questions for clarificationAvoiding making judgments or assumptionsObserving students' nonverbal messagesMaking sure students look you in the eye
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The length of the Achilles tendon increases 0.500 cm when the force exerted on it by the muscle increases from 3230 N to 4787 N.How much work is done by the muscle in stretching the tendon?
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A hoop (i=mr^2) of radius 0.50 m and a mass of 0.20 kg is released from rest and allowed to o go roll down an inclined plane. how fast is it moving after dropping a vertical distance of 3.0 m?a. 7.7 m/sc. 5.4 m/sb. 6.2 m/sd 3.8 m/s
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2.How did Robert Boyle demonstrate that sound needs a medium through which to travel?He found that an alarm watch in a vacuum did not make asound.He found that the speed of sound varied under differentconditions.MacBook AirHe found that an alarm watch under water did not make asound.He recorded the time that distant pistol fire was heard.
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A 5.10 kg cast-iron skillet is heated on the stove from 295 k to 450 k. how much heat had to be transferred to the iron (specific heat of iron is 450j/kg k)?
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a 500 g model rocket is on a cart that is rolling to the right at a speed of 3.0 m/s. the rocket engine, when it is fired, exerts an 8.0 n vertical thrust on the rocket. your goal is to have the rocket pass through a small horizontal hoop that is 20 m above the ground. at what horizontal distance left of the hoop should you launch?
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An odd-shaped object rotates at a speed of 10. 0 rev/s. A small 25 gmass with moment of inertia I=1. 5x10-6 kgm2 is dropped onto theobject at a distance of 4. 5 cm from its center of mass. The odd-shapedobject slows to a speed of 9. 0 rev/s. What is the moment of inertia ofthe odd-shaped object?
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The total mass of the cart is 1. 00 kg, and the mass that is hanging is 0. 200 kg. Calculate the net force on the system, then the acceleration of the system
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what is the apparant position of an object bellw a 6cm thick rectangular block of glass if a 4 cm water is on top of glassnote:in my book it took mew of glass independently .. (I mean with air but there is water is top of it, will it affect mew ?) (a pic is attached check it)
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A helicopter descends vertically to land with a speed of 4. 0 m/s. If the shock absorbers have an initial length of 0. 50 m, they compress to 79% of their original length and the air in the tires absorbs 21% of the initial energy as heat, what is the ratio of the spring constant to the helicopter's mass
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Three 7kg masses are located at points in the xy plane. What is the magnitude of the resultant force (caused by the other two masses) on the mass at the origin? given the universal gravitational constant is 6.6726 x 10^-11.. Answer in units of N. 1) 2.466 x10^-8. (2) 3.08 x10^-8 (3) 2.8336x10^-8 (4) 2.2176x10^-8 (5) 3.2032x10^-8 (6) 2.7104x10^-8 (7) 2.464x10^-8 (8) 2.0944x10^-8 (9) 2.5872x10^-8 (10) 2.3408x10^-8
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Judy shakes one end of a spring up and down with her hand to produce a wave. if she doubles the frequency at which she oscillates the spring, the wavelength in the spring willa: not changeb: doublec: quadrupled: halve
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Delivery of medicines to particular organ or tissue in a human body with the help of a direct current is named electrophoresis. in this case, two oppositely charged plates are applied to the body. (a) find charge that passes through the body during 10 min electrophoresis procedure if current used was =8 ma. (b) find current density value if electrodes area was = 150180 cm2
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