1. joseph is conducting an investigation on how two objects compare in mass, volume, and force with each other. when determining the gravitational force between two objects, which of the following characteristics of the objects should be considered? a mass b volume c state of matter d shape 2. any electrically charged object creates an electric field. walking across carpet in wool socks can create an electric charge. this observation is evidence for which characteristics of electrical forces? a they generate electricity by contact. b they can be generated by electricity. c they can exert a force across a distance. d they are moving due to magnetism. 3. the strength of the gravitational attraction depends on the mass of the objects involved and on the distance between them. the gravitational force between two objects will be lowest in which of the following situations? a both objects have small masses and are close together. b one object has a large mass, and the objects are close together. c both objects have large masses and are close together. d both objects have small masses, and they are far apart. 4. jasmine is conducting an investigation and moves a magnet near a compass, causing the compass needle to move. however, the magnet never touched the compass. this observation is evidence for which characteristics of magnetic fields? a they have a north pole and a south pole. b they can be generated by electricity. c they can exert a force across a distance. d they are constantly changing direction. 6. gabriel is investigating the forces that result from contact. all of the following are types of contact forces, except which of the following? a electrostatic force b air resistance c spring compression d friction force 8. elizabeth and benjamin are investigating the forces that result from electric charges. they rub inflated balloons with wool cloth. which of the following observations supports the claim that the balloons have the same electric charge? a not all the balloons were rubbed with wool. b the balloons were all about the same size. c the balloons repelled each other without touching. d the balloons are made of thin material. 9. the gravitational force between two objects will be greatest in which of the following situations? a both objects have small masses and are close together. b one object has a large mass, and the objects are close together. c both objects have large masses and are close together. d both objects have large masses, and they are far apart. 10. contact forces are forces acting upon two objects in contact. which of the following does not represent a contact force? a pushing an object on the floor b dropping a marble from the roof c kicking a soccer ball across a field d the weight of a pen on a table
Answers: 2
Another question on Physics
Physics, 21.06.2019 17:40
Sarah and michelle work at a tech company that designs exercise apps. sarah tells michelle she has heard that james, their supervisor, interviewed with a competitor and may be leaving the company, which would open up a management position. what kind of power is sarah exerting?
Answers: 1
Physics, 21.06.2019 19:40
Ogle–2013–blg–0723 is an exoplanet that is similar to earth in size and proximity to its star. this exoplanet has mass m=4.18×1024kg and radius r=5.66×106m. an astronaut whose weight on earth is w=735n lands on the planet. a. calculate m, the mass of the astronaut. b. calculate gp? , the acceleration due to gravity on the surface of ogle–2013–blg–0723. c. calculate wp? , the weight of the astronaut on the surface of ogle–2013–blg–0723. d. calculate v, the minimum velocity required to put an object into orbit above ogle–2013–blg–0723. e. calculate t, the time required to complete an orbit around ogle–2013–blg–0723.
Answers: 3
Physics, 22.06.2019 00:00
1134567 a jet with mass m = 1.1 ă— 105 kg jet accelerates down the runway for takeoff at 2 m/s2. 1) what is the net horizontal force on the airplane as it accelerates for takeoff? 2.2*10^5 n your submissions: 2.2*10^5 computed value: 220000submitted: saturday, january 26 at 2: 41 pm feedback: correct! 2) what is the net vertical force on the airplane as it accelerates for takeoff? 0 n your submissions: 0 computed value: 0submitted: saturday, january 26 at 2: 41 pm feedback: correct! 3) once off the ground, the plane climbs upward for 20 seconds. during this time, the vertical speed increases from zero to 21 m/s, while the horizontal speed increases from 80 m/s to 95 m/s. what is the net horizontal force on the airplane as it climbs upward? n 4) what is the net vertical force on the airplane as it climbs upward? n 5) after reaching cruising altitude, the plane levels off, keeping the horizontal speed constant, but smoothly reducing the vertical speed to zero, in 13 seconds. what is the net horizontal force on the airplane as it levels off? n 6) what is the net vertical force on the airplane as it levels off?
Answers: 1
Physics, 22.06.2019 08:00
Aheat engine running backward is called a refrigerator if its purpose is to extract heat from a cold reservoir. the same engine running backward is called a heat pump if its purpose is to exhaust warm air into the hot reservoir. heat pumps are widely used for home heating. you can think of a heat pump as a refrigerator that is cooling the already cold outdoors and, with its exhaust heat qh, warming the indoors. perhaps this seems a little silly, but consider the following. electricity can be directly used to heat a home by passing an electric current through a heating coil. this is a direct, 100% conversion of work to heat. that is, 19.0 \rm kw of electric power (generated by doing work at the rate 19.0 kj/s at the power plant) produces heat energy inside the home at a rate of 19.0 kj/s. suppose that the neighbor's home has a heat pump with a coefficient of performance of 4.00, a realistic value. note: with a refrigerator, "what you get" is heat removed. but with a heat pump, "what you get" is heat delivered. so the coefficient of performance of a heat pump is k=qh/win. an average price for electricity is about 40 mj per dollar. a furnace or heat pump will run typically 200 hours per month during the winter. what does one month's heating cost in the home with a 16.0 kw electric heater? what does one month's heating cost in the home of a neighbor who uses a heat pump to provide the same amount of heating?
Answers: 2
You know the right answer?
1. joseph is conducting an investigation on how two objects compare in mass, volume, and force with...
Questions
Mathematics, 07.04.2020 01:28
Biology, 07.04.2020 01:28
Mathematics, 07.04.2020 01:28
Mathematics, 07.04.2020 01:28
History, 07.04.2020 01:28
History, 07.04.2020 01:28
Mathematics, 07.04.2020 01:29
Spanish, 07.04.2020 01:29
Mathematics, 07.04.2020 01:29
