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mixas84 [53]
2 years ago
8

The total energy of a 0.050 kg object travelling at 0.70 c is:

Physics
2 answers:
Elena L [17]2 years ago
8 0

Answer:

1.1025×10^15Joules

No correct option

Explanation:

The type of energy possessed by the object is kinetic energy. Kinetic energy is the energy due to virtue of an object motion.

KE = 1/2MV² where;

M is the mass of the car = 0.05kg

V is the velocity of the car

Since the car is traveling at 0.7c (c is the speed of light)

speed = 0.7c { 0.7(3×10^8)}

Speed = 2.1×10^8

Substituting this values in the formula given we have;

KE = 1/2×0.05×(2.1×10^8)²

KE = 1.1025×10^15Joules

No correct option.

finlep [7]2 years ago
3 0
What is the unit c denotes here
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A plane flies from base camp to lake a, a distance of 290 km at a direction of 20.0° north of east. after dropping off supplies,
Alchen [17]

We can simply find components of the given directions and conveniently add them up to find the total distance.

290 km 20 deg north of east can be decomposed as :

290 x cos(20) EAST + 290 sin(20) NORTH

=272.5 E + 99.18 N

Now from this point ,

170 Km 30 deg west of north :

170 cos(30) N - 170 sin (30) E   [ east = - west]

= 147.22 N - 85 E

hence coordinates of lake b are

(272.5 - 85) E + (99.18 + 147.22)N

187.5 E +264.4 N

use right triangle property to find distance D = \sqrt{a^2 + b^2}

D = 324.13 Km

and angle = atan(b/a) = 54.65 deg

hence lake b is at 324.13 Km 54.65 deg east of north

3 0
3 years ago
The line spectrum of lithium has a red line at 670.8 nm. Calculate the energy of a photon with this wavelength.
Vadim26 [7]
First of all, we can calculate the frequency of the photon, which is related to the wavelength by the following equation:
f= \frac{c}{\lambda}
where c is the speed of light and \lambda=670.8 nm=670.8 \cdot 10^{-9} m is the photon wavelength. Substituting into the formula, we find the frequency
f= \frac{c}{\lambda}= \frac{3 \cdot 10^8 m/s}{670.8 \cdot 10^{-9} m}=4.47 \cdot 10^{14} Hz

Now we can find the energy of the photon with the following equation:
E=hf
where h is the Planck constant. Substituting numbers, we find
E=hf=(6.6 \cdot 10^{-34}Js)(4.47 \cdot 10^{14} Hz)=2.95 \cdot 10^{-19} J
5 0
3 years ago
Objects A and B, of mass M and 2M respectively, are each pushed a distance d straight up an inclined plane by a force F parallel
krek1111 [17]

Answer:

The correct answer is <u>option (A) that is KEA > KEB .</u>

Explanation:

Let us calculate -

If the object is straighten up and inclined plane , the work done is

W=F_d- F_f_r_id-F_gh

W=F_d-\mu_kmgdcos\theta-mgdsin\theta

The change in kinetic energy is ,

   \Delta K=\frac{1}{2}mv^2-\frac{1}{2}m\nu_0^2

At the top of the inclined plane , the velocity is zero

So,

\Delta K=\frac{1}{2} m(0)^2-\frac{1}{2}m\nu_0^2

\Delta KE=-\frac{1}{2}m\nu_0^2

From the work energy theorem , we have W=-\Delta K in case of friction , so

\frac{1}{2}m\nu_0^2=Fd-\mu_kmgdcos\theta-mgdsin\theta

KE=Fd-\mu_kmgdcos\theta-mgdsin\theta

For object A-

KE_A=Fd-\mu_kmgdcos\theta-mgdsin\theta

For object B

KE_B= Fd -2\mu_kMgdcos\theta-2Mgdsin\theta

KE_B= Fd -2(\mu_kMgdcos\theta-Mgdsin\theta)

Thus , larger mass is going to mean less total work and a lower kinetic energy .

From the above results , we get

KE_A >KE_B

<u>Therefore , option A is correct .</u>

6 0
2 years ago
a 7 kilogram cat is resting on top of a bookshelf that is 2 meters high. what is the cat’s gravitational potential energy relati
attashe74 [19]
PE = mgh
      Mass, m = 7kg, g ≈ 10 m/s², height = 2m     
 
      = 7*10*2
 
       = 140 Joules.


5 0
3 years ago
Read 2 more answers
ОТВЕТЬТЕ !!!!СРОЧНО!!!
FromTheMoon [43]

Answer:

ответ 1.25 × 10‐³ и вот ваш ответ

8 0
2 years ago
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