All categories

2 years ago

A car of mass 550 kg is moving at a speed of 1.5 m/s. A man pushes the car,

Physics

1 answer:

Ad libitum [116K]2 years ago

5 0

Answer:

C. 2197 J

Explanation:

The work done = Energy change

The work done by man = Kinetic energy change of the car

Kinetic energy is the energy possessed by a moving object solely due to its motion.

You can get the K.E. of an object using the equation,

K.E. = (1/2)mv²

So you get,

The work done by man = K.E. change of the car

= (1/2)×550×(3.2)² - (1/2)×550×(1.5)²

= 2197.25 J

You might be interested in

Which of the following is true about acids?

Stells [14]

i would say, are sour and corrode metals

8 0

2 years ago

Read 2 more answers

A material in which charges cannot easily move

weeeeeb [17]

Insulator, or a semi-conductor. A semi-conductor is a specific type of insulator.

3 0

2 years ago

If the beam is made from wood having an allowable shear stress τallow = 390 psi , determine the maximum magnitude of p. set d =

xenn [34]

Answer:

19593.6 p

Explanation:

3 0

2 years ago

Determine the mass of a ball with a velocity of 40.0 m/s and a wavelength of 8.92 Ã 10-34 m.

posledela

The wavelength is equal to Planck's constant divided by the ball's momentum.
This means that:
lambda = h / p .............> equation I
Momentum = mass * velocity ............> equation II

Substitute by equation II in equation I, you get:
lambda = h / mv
Now, we are given:
lambda = 8.92 * 10^-34 m
Planck's constant = 6.625 * 10^-34
velocity = 40 m/sec

Substitute with these givens in the above equation to calculate the mass as follows:
8.92*10^-34 = (6.625*10^-34) / (40*m)
mass = 0.0185678 kg

4 0

2 years ago

You are standing on the sidewalk, waiting to cross Michigan Street. A Toyota RAV4 (~2500 lbs) goes by at 30 MPH. Assuming you ar

Montano1993 [528]

Answer:

$9.27\times 10^{4} Kg.m^{2}/s$

Explanation:

Angular momentum is given by mvr where m is mass of the car, v is the speed of the car and r is the distance from the centre of the lane.

In this case, mass is 2500 lbs which to convert to Kg we multiply by 0.453592 hence 2500*0.453592=1133.98

Also, the speed we convert from mph to m/s by multiplying by 0.44704 hence 30*0.44704=13.4112 m/s

Finally, the distance given in ft is converted to m by multiplying it by 0.3048

The angular momentum will then be $1133.98*13.4112*20*0.3048\approx 9.27\times 10^{4} Kg.m^{2}/s$

6 0

3 years ago