A 42 % efficient device uses chemical energy to generate 600 J of electric energy.
A 42 % efficient device uses chemical energy to generate 600 J of electric energy.
Question 2 Which device converts electric energy into mechanical work? O the electric motor O the electric generator the transformer otherheostat Question 3 Light is an example of a wave. O electromagnetic mechanical O longitudinal luminiferous ether Question 4 20 pts ні ер
Cells generate ATP from the release of chemical energy from nutrients, whereas chlorophyll-containing organisms generate ATP via the light-dependent reactions of photosynthesis as well as from the oxidation of nutrients. true or false
hydro-electric power plants use falling water to generate electricity. Does a typical waterfall generate enough energy to power a light-bulb? Make the appropriate approximations in terms of heigh and amount of water falling down.
For saving energy, bicycling and walking are far more efficient means of trans- port than is travel by car. For example, when riding at 16 km/h, a cyclist uses food energy at a rate of about 1670 kJ/h above what he would use if merely sitting still. Walking at 5 km/h requires about 940 kJ/h. It is interesting to compare these values with the energy consumption required for travel by car. Petrol yields about 3.4x10'J per litre. The Volkswagen Golf...
A 240-V electric motor is 90% efficient, meaning that 90% of the energy supplied to it ends up as mechanical work. (a) If the motor lifts a 200-N weight at 3.1 m/s, how much current does it draw? (b) Let's check your answer in part (a). We expect that the less efficient the motor operates, the larger the current that must be drawn to supply the required power. Does the expression for the current drawn you have derived in part...
1. electrical energy is applied to a system enclosed inside
the piston-cylinder device shown. the voltage is 10 volts and the
current is 2 amps for 20 seconds. during this time there is a heat
transfer from the system to the outside equal to 90J, the system
expands 0.2m^3 at a constant pressure of 200 kPa.
1. the amount of electrical energy in J applied to the system
is?
2. the expansion work in J is ?
3. the increase...
What is the change in internal energy of a chemical reaction that requires 75.7 J of heat and produces a gas that does 68.5 J of work on the surroundings? Select one: o a.-7.20 J O b.-144 J O c. 7.20 J o d. 144 J
The electric eel (Electrophorus electricus) can generate a potential difference of 600 V between a region just behind its head and its tail. Suppose an unsuspecting fish swims into this area, resulting in a lethal current of 1.1 A passing through the length of its body. If the fish is approximately 31 cm in length and 7.5 cm in diameter, what is its average resistivity?
The electric potential energy stored in the capacitor of a defibrillator is 110 J, and the capacitance is 150 μF. What is the potential difference across the capacitor plates?
During an experiment, a certain device produces a constant, uniform electric field of (32.7 N/C)i + (80.5 N/C)j Nearby, a student holds a large circular hoop with a diameter of 1.25 m such that the hoop is parallel to the xz-plane. What is the electric flux through the hoop? ________ (N*m^2)/C Another student bumps the field-producing device so that the electric field is now (23.7 N/C)i + (15.5 N/C)k What is the new electric flux through the hoop? ________ (N*m^2)/C