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4 years ago

I NEED HELP LIKE RIGHT NOW!! please

1 answer:

3 0

1. I'm not sure about this one but I think its false, not all energy resources are limited to one country - thus don't need to be traded. Like I said, I'm not very confident with this answer.

2. False, The amount of neutrons in an atom does not change its identity. The variation of protons will change the identity though.

3. False, The splitting of an atom's nucleus is called Nuclear Fission, not Fusion

4. False, This was meant to mess you up, 1000 milliliters equals 1 liter (since "milli" means 1000)

5. False, 2 meters would be closer to 6 feet

6. False, 100 centimeters equals 1 meter

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Mathematically, explain how a car (A) with mass of 500 kg and velocity of 2 m/s has the same kinetic energy as a car (B) with ma

scoray [572]

Answer:

Both kinetic energies are equal

Explanation:

Kinetic Energy

Is the type of energy of an object due to its state of motion. It's proportional to the mass and the square of the speed.

The equation for the kinetic energy is:

$\displaystyle K=\frac{1}{2}mv^2$

Where:

m = mass of the object

v = speed of the object

The kinetic energy is expressed in Joules (J)

There are two cars:

Car (A) with mass ma=500 kg and speed va= 2 m/s

Car (B) with mass mb=20,000 gr and speed vb= 10 m/s

Calculate the kinetic energy of both cars:

$\displaystyle K_a=\frac{1}{2}m_av_a^2$

$\displaystyle K_a=\frac{1}{2}500*2^2$

$\displaystyle K_a=250*4=1,000 J$

To calculate the Kb, the mass must be expressed in kg:

mb=20,000/1,000 =20 Kg

$\displaystyle K_b=\frac{1}{2}m_bv_b^2$

$\displaystyle K_b=\frac{1}{2}20*10^2$

$\displaystyle K_b=10*100=1,000 J$

Both kinetic energies are equal

8 0

3 years ago

At t = 0 the components of a radio-controlled car's velocity are vx = 0.5 m/s and vy = 1.2 m/s. Find the components of the car's

FinnZ [79.3K]

Answer:

x-component of velocity = 5.7 m/s

y-component of velocity = -1.4 m/s

Explanation:

Use first equation of motion to find components of velocity at a given time:

$v = u + at$

where, $v$ is the final velocity, $u$ is the initial velocity, $a$ is the acceleration and $t$ is the time.

Given:

$u_x= 0.5 m/s\\u_y=1.2 m/s\\a_x=2 m/s^2\\a_y=-1m/s^2\\t = (2.6-0)s =2.6 s$

$v_x=u_x+a_xt\\\Rightarrow v_x=0.5+2\times 2.6\\\Rightarrow v_x=5.7 m/s$

$v_y=u_y+a_yt\\\Rightarrow v_y=1.2-1\times 2.6\\\Rightarrow v_y=-1.4 m/s$

5 0

3 years ago

An object's mass refers to _____ and an object's weight refers to _____. Fill in each blank.

mamaluj [8]

Answer:

Explanation:

because the more mass it has the more dense it is

6 0

3 years ago

What is photosynthesis, food chain, evaporation and passive smokers?

navik [9.2K]

Answer:

Photosynthesis: the process where plants convert light energy into sugar, for food

Food chain: a series of organisms showing which organisms eat each other

Explanation:

7 0

3 years ago

Vector A⃗ points in the positive y direction and has a magnitude of 12 m. Vector B⃗ has a magnitude of 33 m and points in the ne

Sergio [31]

direction is neg x

mag is 21m

5 0

3 years ago

Read 2 more answers