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3 years ago

PLEASE HURRY!!!

Physics

1 answer:

Alona [7]3 years ago

8 0

Acceleration = (change in speed)/(time)

Change in speed = (60-15) = 45 km/hr

Time for the change = 30 sec

Acceleration = 1.5 km/hr-sec

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The Kinetic energy, K, of an object with mass m moving with velocity v can be found using the formula - E_{\text{k}}={\tfrac {1}

tester [92]

Answer:

The ratio of kinetic energies of 5 kg object to 20 kg object is 1:1.

Explanation:

Kinetic energy is defined as energy possessed by an object due to its motion.It is calculated by:

$K.E=\frac{1}{2}mv^2$

Kinetic energy of the 5 kg object.

Mass of object,m = 5 kg

Velocity of an object = v

$K.E=\frac{1}{2}mv^2=\frac{1}{2}\times 5kg\times v^2$

Kinetic energy of the 20 kg object.

Mass of object,m' = 20 kg

Velocity of an object = v'

$K.E=\frac{1}{2}mv^2=\frac{1}{2}\times 20kg\times v'^2$

The ratio of the kinetic energy of the 5 kilogram object to the kinetic energy of the 20-kilogram object:

$\frac{K.E}{K.E'}=\frac{\frac{1}{2}\times 5kg\times v^2}{\frac{1}{2}\times 20kg\times v'^2}$

Given that, v = 2v'

$\frac{K.E}{K.E'}=\frac{1}{1}$

The ratio of kinetic energies of 5 kg object to 20 kg object is 1:1.

3 0

3 years ago

If you go to the beach on a hot summer day, the temperature of the sand is much higher than the temperature of the water. If we

guapka [62]

Water has a higher specific heat so it requires more energy to heat than sand.

7 0

3 years ago

Read 2 more answers

Three capacitors with capacitances:

mr_godi [17]

Answer:

A. 80.0microColoumbs

B.120.0 microcoloumbs

C.37.3v

Explanation:

See attached file

6 0

4 years ago

The movement of the Australian plate pushes Australia north at an average speed of about 17 cm per year. What will Australia's d

stealth61 [152]

Answer: 170m

Explanation:

V=d/t

V= velocity

D= displacement

T=time

D=v*t

D=17*1000

D= 17000cm

Convert to metres

D= 17000/100

D= 170m

5 0

3 years ago

A Scooter with a mass of 50 kilograms travels with a speed of 10 meters per second. A 2 Nt force bring it to a halt. How long ti

Serga [27]

Answer:

250s

Explanation:

Given parameters:

Mass = 50kg

Speed = 10m/s

Force = 2N

Unknown:

Time the force was acting = ?

Solution:

To solve this problem, we use the equation of motion from the second law of Newton:

Ft = mV

F is the force

t is the time taken

m is the mass

V is the velocity

2 x t = 50 x 10

t = 250s

3 0

3 years ago