Driving on asphalt roads entails very little rolling resistance, so most of the energy of the engine goes to overcoming air resistance. but driving slowly in dry sand is another story. if a 1200 kg car is driven in sand at 5.2 m/s, the coefficient of rolling friction is 0.06. in this case, nearly all of the energy that the car uses to move goes to overcoming rolling friction, so you can ignore air drag in this problem.
a. what propulsion force is needed to keep the car moving forward at a constant speed?
b. what power is required for propulsion at 5.2 m/s?
if the car gets 15 mpg when driving on sand, what is the car's efficiency? assume the density of gasoline is 719.7 kg/m^3.
!
Answers: 1
Physics, 22.06.2019 15:20
Acarpenter builds an exterior house wall with a layer of wood 2.9 cm thick on the outside and a layer of styrofoam insulation 2.3 cm thick on the inside wall surface. the wood has k=0.080w/(mâ
k), and the styrofoam has k= 0.010 w/(mâ
k). the interior surface temperature is 19.0 âc , and the exterior surface temperature is -15.0 âc . a.)what is the temperature at the plane where the wood meets the styrofoam? celsius b.)what is the rate of heat flow per square meter through this wall? /m^2
Answers: 2
Physics, 23.06.2019 18:00
What force is responsible for making fusion possible in the sun? a- gravitational force b- electromagnetic force c- weak nuclear force d- strong nuclear force
Answers: 2
Physics, 24.06.2019 02:20
Design a system with the following state changes: this is a sequential circuit with three flip-flops. the state sequence is changed with a clock as in the order of, 111, 010, 100,110, 001, 011, 101, 000, 111 and repeat. use jk flip-flops.
Answers: 1
Driving on asphalt roads entails very little rolling resistance, so most of the energy of the engine...
Biology, 05.05.2020 08:55
English, 05.05.2020 08:55
History, 05.05.2020 08:55
History, 05.05.2020 08:55
Biology, 05.05.2020 08:55
Mathematics, 05.05.2020 08:55
Arts, 05.05.2020 08:55
Mathematics, 05.05.2020 08:55
History, 05.05.2020 08:55
English, 05.05.2020 08:55
Mathematics, 05.05.2020 08:55
History, 05.05.2020 08:55