Mustang sally just finished restoring her 1965 ford mustang car. to save money, she did not get a new battery. when she tries to start the car, she discovers that the battery is dead (an insufficient or zero voltage difference across the battery terminals) and so she will need a jump start. here is how she accomplishes the jump start: she connects a red jumper cable (wire) from the positive terminal of the dead battery to the positive terminal of a fully functional new battery. she connects one end of a black jumper cable to the negative terminal of the new battery. she then connects the other end of the black jumper cable to the negative terminal of the dead battery. the new battery (now in a parallel with the dead battery) is now part of the circuit and the car can be jump started. the car starter motor is effectively drawing current from the new battery. after the car with the dead battery is running, the cables can be disconnected in the reverse order that they were connected. while unhooking the jumper cables, the positive and negative cables almost touch and a spark jumps between the ends of the cables. this spark is caused by the movement of electrons through the air between the battery terminals. in what direction are the electrons traveling during the spark? view available hint(s)

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?

Based on the concept of the wave-like nature of light, huygens' theory of light postulates that the more light was "bent" by a substance the slower it would move while traversing across that substance. a) deflection b) interference c) refraction d) resonance

Imagine that you have two balloons (or, better yet, actually inflate two balloons, if possible). create static electricity around one of the balloons by rubbing it against your hair or your sweater and then bring that balloon close to the other balloon, which has not been charged. try this with at least one other object—and for variety in the discussion, avoid using an object already described by your classmates. then, for your initial post to the discussion, answer the following questions: what happened with the two balloons?