Ask question

Ask question

All categories

4 years ago

11

An initially stationary object experiences an acceleration of 6 m/s2 for a time of 15 s. How far will it travel during that time

?

1 answer:

Arisa [49]4 years ago

4 0

Explanation:

Distance = (intial speed)X(Time) + 1/2(acceleration)X(Time) [Third equation of motion]

As initial speed is zero, therefore;

Distance = 1/2(acceleration)X(Time)

= 1/2 (6 X 15)

= 1/2 (90)

= 45 meters

Hence, the object traveled 45 meters.

You might be interested in

A cube has a density of 1800 kg/m3 while at rest in the laboratory. What is the cube's density as measured by an experimenter in

olga2289 [7]

Answer:

4341.44763 kg/m³

Explanation:

$\rho'$ = Actual density of cube = 1800 kg/m³

$\rho$ = Density change due to motion

v = Velocity of cube = 0.91c

c = Speed of light = $3\times 10^8\ m/s$

Relativistic density is given by

$\rho=\frac{\rho'}{\sqrt{1-\frac{v^2}{c^2}}}\\\Rightarrow \rho=\frac{1800}{\sqrt{1-\frac{0.91^2c^2}{c^2}}}\\\Rightarrow \rho=\frac{1800}{\sqrt{1-0.91^2}}\\\Rightarrow \rho=4341.44763\ kg/m^3$

The cube's density as measured by an experimenter in the laboratory is 4341.44763 kg/m³

5 0

4 years ago

The comparison of work output to work input is called the mechanical. advantage.. a. true. b. false

miv72 [106K]

B)False........... It's efficiency factor

5 0

3 years ago

what frequency of light must an electron in hydrogen absorb to jump from the n=2 state to the n=5 state? (a) 2.86 Hz (b) 4.08 Hz

Ostrovityanka [42]

Answer:

(c) 6.91x10^14 Hz

Explanation:

Find the level energy of n=2 and n=5, using the formula:

$E = -E_0/n^2$

where $E_0=13.6eV$

$E_2 =\frac{-13.6}{2^2}=-3.4eV$

$E_5 =\frac{-13.6}{5^2}=-0.544eV$

To jump from n=2 to n=5 the electron absorbs a photon with energy equal to $(-0.544) - (-3.4)=2.856eV$ , using the next formula to find specific wavelength $\lambda$ to that energy

$E = hc/\lambda$

Where $c$ is the speed of light ( $c=3 \times10^8m/s$ ) and $h$ is Planck's constant ( $h=4.14\times10^{-15}eVs$ ). Solve for $\lambda$ :

$E = hc/\lambda\\\lambda E = hc\\\lambda = \frac{hc}{E} \\\lambda = \frac{(4.14\times10^{-15})(3 \times10^8)}{2.856}=4.35\times10^{-7}m$

The frequency of this wavelength is calculated with this formula:

$f=\frac{c}{\lambda}$

$f=\frac{3\times10^8}{4.3487\times10^{-7}} =6.89\times10^{14}Hz\approx6.9\times10^{14}Hz$

8 0

4 years ago

Which type of nuclear waste comes from the production of weapons by the military

STALIN [3.7K]

Transuranic.

I got this from yahoo

3 0

4 years ago

Read 2 more answers

A 0.023 kg golf ball moving at 18.9 m/s crashes through the window of a house in 5.4 × 10−4 s. After the crash, the ball contin-

PolarNik [594]

Force can be expressed as the time-rate change of momentum

Mathematically, Force = Change in momentum/change in time

Change in momentum = m(10.1-18.9) = -0.2024

Force = -2024/5.4 = -375N(approx)

The significance of the '-' sign is that the direction of force is the opposite that of the direction of our velocities since we assumed them to be positive.

Also this is the force on the ball, the force on the window will be equal and opposite.

7 0

3 years ago