I NEED HELP WITH THE LAST QUESTION ASAP D':

What is the acceleration of a 32-kg object if a 6.75-N force is applied to it?

professor190 [17]

F=MA
*newton 2nd law*
F=6.75N
M=32kg

A= F/M
A=6.75/32
equal
a.0.21m/s2

5 0

2 years ago

Find the speed for a star in which this line appears at wavelength 120.2 nm . Express your answer to three significant figures a

levacccp [35]

Answer:

The speed of the star is $-3.45x10^{6}m/s$

Explanation:

Spectral lines will be shifted to the blue part of the spectrum if the source of the observed light is moving toward the observer, or to the red part of the spectrum when it is moving away from the observer (that is known as the Doppler effect).

$Redshift: \lambda_{measured} > \lambda_{0}$

$Blueshift: \lambda_{measured} < \lambda_{0}$

The wavelength at rest is 121.6 nm ( $\lambda_{0} = 121.6nm$ )

Due to that shift the velocity of the star can be determined by means of Doppler velocity.

$v = c\frac{\Delta \lambda}{\lambda_{0}}$ (1)

Where $\Delta \lambda$ is the wavelength shift, $\lambda_{0}$ is the wavelength at rest, v is the velocity of the source and c is the speed of light.

$v = c(\frac{\lambda_{measured}- \lambda_{0}}{\lambda_{0}})$

In this case $\lambda_{measured}$ is equal to 120.2 nm.

$v = (3x10^8m/s)(\frac{120.2 nm - 121.6 nm}{121.6 nm)})$

$v = -3.45x10^{6}m/s$

Hence, the speed of the star is $-3.45x10^{6}m/s$ .

Notice that the negative velocity means that the star is moving toward the observer.

8 0

2 years ago

A 22.0 kg child slides down a slide that makes a 37.0° angle with the horizontal. (a) What is the magnitude of the normal force

patriot [66]

Answer:

(a) 172.185 N

(b) $53^{\circ}$

Solution:

As per the question:

Mass of the child, m = 22.0 kg

Angle, $\theta = 37.0^{\circ}$

Now,

(a) The magnitude of the normal force exerted by the slide on the child:

$F_{N} = mgcos\theta$

$F_{N} = 22\times 9.8cos37^{\circ} = 172.185\ N$

Now,

(b) The angle from the horizontal at which the force is directed is:

$90^{\circ} - 37^{\circ} = 53^{\circ}$

6 0

3 years ago

What is the difference between light energy and heat energy

MrRissso [65]

ANSWER:

What is the difference between heat and light? - Physics Stack ... Heat and light are different but they are both forms of energy. Heat is a form of kinetic energy contained in the random motion of the particles of a material. Light is a form of electromagnetic energy. As with other forms of energy, heat energy can be transformed into light energy and vice versa.

4 0

3 years ago

This illustration represents the compoundA)carbon oxide.B)carbon dioxide.C)carbon monoxide.EliminateD)monocarbon oxide.

pentagon [3]

B.) Carbon Dioxide because the carbon is surrounded by oxygen

3 0

3 years ago

Read 2 more answers