How much work is done ON THE BOOK witih mass of 10 kg that is being pushed across a 2m table at 5m/s?

Represent 7468 N with SI units having an appropriate prefix. Express your answer to four significant figures and include the app

sergeinik [125]

Answer:

7.468 kN

Explanation:

Here the force of 7468 Newton is given.

Some of the prefixes of the SI units are

kilo = 10³

Mega = 10⁶

Giga = 10⁹

The number is 7468.0

Here, the only solution where the number of significant figures is kilo

1 kilonewton = 1000 Newton

$1\ Newton=\frac{1}{1000}\ kilonewton$

$\\\Rightarrow 7468\ Newton=\frac{7468}{1000}\ kilonewton\\ =7.468\ kilonewton$

So 7468 N = 7.468 kN

3 0

3 years ago

German physicist Werner Heisenberg related the uncertainty of an object's position ( Δ x ) to the uncertainty in its velocity (

timama [110]

According to the information given, the Heisenberg uncertainty principle would be given by the relationship

$\Delta x \Delta v \geq \frac{h}{4\pi m}$

Here,

h = Planck's constant

$\Delta v$ = Uncertainty in velocity of object

$\Delta x$ = Uncertainty in position of object

m = Mass of object

Rearranging to find the position

$\Delta x \geq \frac{h}{4\pi m\Delta v}$

Replacing with our values we have,

$\Delta x \geq \frac{6.625*10^{-34}m^2\cdot kg/s}{4\pi (9.1*10^{-31}kg)(0.01*10^6m/s)}$

$\Delta x \geq 5.79*10^{-9}m$

Therefore the uncertainty in position of electron is $5.79*10^{-9}m$

8 0

3 years ago

Which statement is true for a series circuit?

Anni [7]

Each of those choices has some truth to it, but three of the five choices also include some nonsense.

A. The voltage divides proportionally among all resistors in the circuit.

B. As more resistors are added, the current will decrease. True, because the total resistance will increase.

C. The sum of the voltage drops will be the total voltage in the circuit.

D. The current is the same through all resistors in the circuit.

E. The equivalent resistance will be greater than the individual resistors. True, because the equivalent resistance is the sum of the individual resistors.

7 0

3 years ago

Read 2 more answers

When you used the energy in our body to pull the rubber band, it was transformed into elastic potential energy. We know that ene

GuDViN [60]

Answer:

Converted to heat energy

Explanation:

Some of the elastic potential energy is transformed into heat energy. When we stretch a rubber band, it is often observed that the rubber becomes warmer after the stretch and even during the stretch.

Some energy in the band initially at rest will be converted into elastic potential energy and heat energy as it is stretched .

The heat energy is not usually accounted for since the major concern most times is the elastic energy.
In this process, heat energy becomes a waste energy.
By deducing the efficiency, we would find that this transformation is not efficient as predicted by one of the laws of thermodynamics.

3 0

3 years ago

In 1977, Kitty O'Neil drove a hydrogen peroxide-powered rocket dragster for a record time interval (3.22 s) and final speed (663

Tom [10]

Answer:

a) 0.05719 km/s^2

b) 0.00921 km/s^2

Explanation:

average acceleration can be calcuated as follows

$a=\frac{\Delta v}{\Delta t} = \frac{v_f-v_i}{t_f-t_i}$

a)

- In the initial time ( $t_i=0$ ), just before of race start the rocket is at rest. So $v_i=0$ .

- After 3.22 s the rocket reach 663 km/h, So $t_f=3.22 s$ and the $v_f=663 km/h$ . We convert units from km/h to km/s to have the same time units (seconds) the velocity would be:

$663 \frac{km}{h}*\frac{1 h}{3600 s} = 0.18467 km/s$

(take into accoun that 1 h=3600 s)

and acceleration is:

$a= \frac{0.184167 km/s-0 km/s}{3.22s-0s}= 0.05719 km/s^2$

b)

acceleration while stopping is calculate with the same formula but now

-we define the initial time ( $t_i=0$ ) the instant just before begining the stopping. At this instant the velocity is 663 km/h which is the same as 0.18467 km/s.

-After 20 seconds the rocket stops. So tex]t_f=20 s[/tex] and $v_f=0$

So, acceleration is:

$a= \frac{0km/s-0.184167 km/s}{20s-0s}= 0.00921 km/s^2$

3 0

3 years ago