Which statement best describes how private industry decides where to spend on research and development

If an object has a kinetic energy of 30 j and mass of 34kg how fast is the object moving ?

cricket20 [7]

Ek = (m*V^2) / 2 where m is mass and V is speed, then we can take this equation and manipulate it a little to isolate the speed.

Ek = mv^2 / 2 — multiply both sides by 2

2Ek = mv^2 — divide both sides by m

2Ek / m = V^2 — switch sides

V^2 = 2Ek / m — plug in values

V^2 = 2*30J / 34kg

V^2 = 60J/34kg

V^2 = 1.76 m/s — sqrt of both sides

V = sqrt(1.76)

V = 1.32m/s (roughly)

3 0

3 years ago

A 750-kg car moving at 23 m/s brakes to a stop. Assume that all the kinetic energy is transformed into thermal energy. The brake

ahrayia [7]

Answer:

The temperature of the brakes is 29.38°C.

Explanation:

Given that,

Mass of car = 750 kg

Speed = 23 m/s

Mass of iron = 15 kg

We need to calculate the kinetic energy of car

Using formula of kinetic energy

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

$K.E=\dfrac{1}{2}\times750\times23^2$

$K.E=198.375\ kJ$

We need to calculate the temperature of the brakes

Using formula of energy

$K.E=mc\Delta T$

Put the value into the formula

$198.375=15\times0.450\times\Delta T$

$\Delta T=\dfrac{198.375}{15\times0.450}$

$\Delta T=29.38^{\circ}C$

Hence, The temperature of the brakes is 29.38°C.

7 0

4 years ago

Perform an experiment in which you flip a switch 2,300,000 times. Write this

ryzh [129]

Answer:

B. 2.3 x 10⁶

Explanation:

To calculate scientific notation for the number 2,300,000, we have to follow this notation

a × 10^b

Step 1 :

To find a we have to write the non-zero digits placing a decimal after the first non-zero digit.

2,300,000 to 2.300000

Step 2 :

Now, to find b count how many numbers of digits are there to the right of the decimal.

2.300000

Hence, there are 6 digits to the right of the decimal.

Step 3 :

Since, we had found the value of a and b, we can now reconstruct the number into scientific notation.

a = 2.3

b = 6

2.3 × 10⁶

Therefore, option b is correct.

4 0

2 years ago

you toss a bowling ball straight up into the air with a speed of 2.1. how long does it take the bowling ball to reach its highes

omeli [17]

I am going to assume 2.1 metres per second and that we're rounding acceleration due to gravity to -10 metres per second squared. At the highest point, velocity is going to be 0. v= intial velocity + acceleration*time, sub in 0 for velocity, 2.1 for initial velocity and -10 for acceleration to get 0= 2.1-10t. Now solve for t. t=0.21 seconds.

3 0

3 years ago

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what is the average velocity if the initial velocity of an object is 10 m/s and the final velocity is 28 m/s?

sashaice [31]

19 m/s is the average velocity if the initial velocity of an object is 10 m/s and the final velocity is 28 m/s.

Explanation:

The initial and final velocity is given and the average velocity is asked, which can be calculated by the following method,

Given that initial velocity = 10 m/s and final velocity = 28 m/s

As we know that the average velocity = $\frac{\text {final velocity}+\text {inital velocity}}{2}$

Although, $\text {averge velocity}=\frac{\text {total displacement}}{\text {total time}}$

But here, there is only given initial and final velocity therefore it will be simply an average of the two.

$\text {average velocity}=\frac{10+28}{2}=\frac{38}{2}=19 \mathrm{m} / \mathrm{s}$

Therefore, the average velocity of the object is 19 m/s.

3 0

4 years ago

Read 2 more answers