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3 years ago

A bobsled accelerates from rest at a constant rate of 2 m/s2. How fast is it going after 3.5 seconds

Physics

1 answer:

BabaBlast [244]3 years ago

8 0

Answer:

7m/s

Explanation:

Using the equation of motion;

v = u+at

u = 0m/s

t = 3.5secs

a = 2m/s^2

Get the required velocity

v = 0 + 2(3.5)

v = 2(3.5)

v = 7.0m/s

Hence the body is moving with a speed of 7m/s

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Adam and kevin are roommates. Adam can clean their apartment in 45 minutes. Kevin can clean it in 60 minutes. Rounded to the nea

Karo-lina-s [1.5K]

If you add both numbers together it makes 105 but we’re talking time so it’ll be an hour and 45 minutes for them to clean their apartment.

5 0

3 years ago

What is the wavelength, in nm, of a photon with energy

lara31 [8.8K]

Answer:

(a) λ = 4136 nm → infrared

(b) λ = 413.6 nm → visible light

Explanation:

The wavelength of infrared is on the range of 700 nm to 1000000 nm

The wavelength of visible light is between 400 nm and 700 nm

The wavelength of ultraviolet ray on the range of 10 nm to 400 nm

The wavelength of photon is given by;

E = hf

f is the frequency of the wave = c / λ

$E = h\frac{c}{\lambda}\\\\ \lambda = \frac{hc}{E}$

Where;

c is the speed of light = 3 x 10⁸ m/s

h is Planck's constant = 6.626 x 10⁻³⁴ J/s

(a) 0.3 eV = 0.3 x 1.602 x 10⁻¹⁹ J

$\lambda = \frac{(6.626 * 10^{-34})(3*10^8)}{(0.3)*(1.602*10^{-19})}\\\\\lambda = 4.136 *10^{-6} \ m$

λ = 4136 x 10⁻⁹ m

λ = 4136 nm → infrared

(b) 3.0 eV

$\lambda = \frac{(6.626 * 10^{-34})(3*10^8)}{(3)*(1.602*10^{-19})}\\\\\lambda = 4.136 *10^{-7} \ m$

λ = 413.6 x 10⁻⁹ m

λ = 413.6 nm →visible light

$\lambda = \frac{(6.626 * 10^{-34})(3*10^8)}{(30)*(1.602*10^{-19})}\\\\\lambda = 4.136 *10^{-8} \ m$

λ = 41.36 x 10⁻⁹ m

λ = 41.36 nm →ultraviolet

5 0

3 years ago

Define distance and displacement with illustration

Deffense [45]

Answer:

<h2>Distance</h2>

The length of the actual path travelled by a body is called distance travelled by a body.It is a scalar Quantity.It is measured in meter(m) in SI system.

<h2>Displacement</h2>

The shortest distance from initial position to the final position of a body is called displacement of the body.It is a vector Quantity.It is measured in meter(m) in SI system..