Physics, 19.12.2019 06:31, Jazongamez1987

Acar of mass 1,200 kg is travelling along a straight horizontal road at a speed of 20 m/s when it brakes sharply then skids. friction brings the car to rest. if the coefficient of friction between the tires and road is 0.8, calculate: a. the deceleration ( -7.84 m/s2)

Answers: 1

Show answers

Answers

answered: yoyo0123

The deceleration of the car is $-7.84\ m/s^2$

Explanation:

It is given that,

Mass of the car, m = 1200 kg

Initial speed of the car, u = 20 m/s

Friction brings the car to rest, final speed, v = 0

The coefficient of friction between the tires and road is 0.8

Let a is the deceleration of car due to force of friction. The frictional force is given by :

$f_k=\mu mg$

$a=-\dfrac{f_k}{m}$

$a=-\dfrac{\mu mg}{m}$

$a=-\mu g$

$a=-0.8\times 9.8$

$a=-7.84\ m/s^2$

So, the deceleration of the car is $-7.84\ m/s^2$ . Hence, this is the required solution.

answered: Guest

so here is the information for current research:

-nrel's geothermal analysts, scientists, and engineers perform a full range of research from developing advanced methods of locating and accessing geothermal resources to exploring innovative technologies to extract and produce clean energy from the heat of the earth

and here is the information for the technology of geothermal energy:

-it's clean and sustainable

-resources of geothermal energy range from the shallow ground to hot water and hot rock found a few miles beneath the earth's surface, and down even deeper to the extremely high temperatures of molten rock called magma

-almost everywhere, the shallow ground or upper 10 feet of the earth's surface maintains a nearly constant temperature between 50° and 60°f (10° and 16°c)

-geothermal heat pumps can tap into this resource to heat and cool buildings

-a geothermal heat pump system consists of a heat pump, an air delivery system (ductwork), and a heat exchanger-a system of pipes buried in the shallow ground near the building

-in the winter, the heat pump removes heat from the heat exchanger and pumps it into the indoor air delivery system

-in the summer, the process is reversed, and the heat pump moves heat from the indoor air into the heat exchanger

-the heat removed from the indoor air during the summer can also be used to provide a free source of hot water

answered: Guest

explanation:

considering the bohr theory, the type of connection that requires the transfer the answer conuldn't be right

Other questions on the subject: Physics

Physics, 22.06.2019 07:50, brittneeyy

Determine the fraction of the magnitude of kinetic energy lost by a neutron (m1 = 1.01 u) when it collides head-on and elastically with a target particle at rest which is 21h (heavy hydrogen, m = 2.01 u).

Answers: 3

continue

Physics, 22.06.2019 15:30, Christyy1837

What are the similarities & differences between a thermistor and a light dependent resistor in physics?

Answers: 2

continue

Physics, 22.06.2019 16:30, sti192

The air in an automobile tire with a volume of 2.60 ft3 is at 70°f and 21 psig. determine the amount of air that must be added to raise the pressure to the recommended value of 30 psig. assume the atmospheric pressure to be 14.6 psia and the temperature and the volume to remain constant. the gas constant of air is ru = 53.34ft⋅lbflbm⋅r(1 psia144 lbf/ft2) = 0.3704 psia⋅ft3lbm⋅r the amount of air that must be added to raise the pressure is lbm

Answers: 3

continue

Physics, 22.06.2019 19:30, VonneB1684

Which describes increasing the efficiency of energy resource

Answers: 1

continue

Do you know the correct answer?

Acar of mass 1,200 kg is travelling along a straight horizontal road at a speed of 20 m/s when it br...