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2 years ago

Kelsey the triathelete swims 1.5 km east, then bikes 40 km north, and then runs 10 km west. Which choice gives the

Physics

1 answer:

Fittoniya [83]2 years ago

3 0

Answer:

Hey,. its a simple question. hope you learn from the solution. check attached picture

Explanation:

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A particle with charge − 3.74 × 10 − 6 C is released at rest in a region of constant, uniform electric field. Assume that gravit

dalvyx [7]

Answer:

57.5022228905 s

Explanation:

$V_i$ = Initial voltage

$V_f$ = Final voltage = 0.401 V

$t_1$ = Initial time = 8.36 s

$t_2$ = Final time

K = Kinetic Energy = $3.18\times 10^{-8}\ J$

C = Charge = $3.74\times 10^{-6}\ C$

Voltage is given by

$V=\dfrac{K}{C}\\\Rightarrow V=\dfrac{3.17\times 10^{-8}}{3.74\times 10^{-6}}\\\Rightarrow V=0.00847593582888\ V$

We have the relation

$\dfrac{V_i}{V_f}=(\dfrac{t_i}{t_f})^2\\\Rightarrow t_f=\sqrt{\dfrac{t_i^2V_f}{V_i}}\\\Rightarrow t_f=\sqrt{\dfrac{8.36^2\times 0.401}{0.00847593582888}}\\\Rightarrow t_f=57.5022228905\ s$

The time taken is 57.5022228905 s

4 0

2 years ago

A turtle starts at a velocity of 2 m/s and accelerates at a rate of 3 m/s2. How long will it take the turtle to reach a final ve

luda_lava [24]

U= 2m/s
a= 3m/s^2
v= 11m/s
t=?

We know that a= v-u/t
t = v-u/a
t = 11-2/3
= 9/3
=3 seconds

Hope it helps!

6 0

2 years ago

If two objects are the same size but one object is 3 times hotter than the other object, the hotter object emits If two objects

Illusion [34]

Answer:

81 times the first body

Explanation:

Let the temperature of the first object is T.

The temperature of the second object is 3T.

According to the Stefan's law, the energy radiated per unit area per unit time is given by

$E \alpha T^{4}$

So, for the first body

$E_{1} \alpha T^{4}$ .... (1)

for the second body

$E_{2} \alpha (3T)^{4}$ ..... (2)

By equation (1) and (2),

E2 = 81 times E1

So, the second body gives 81 times more energy per unit area per unit time

8 0

3 years ago

What is radioactivity????

butalik [34]

Radioactivity is a nuclear phenomenon. It is the process of spontaneous emission of α (alpha particles) or β (beta particles) and γ (gamma particles ) radiations from the nucleus of atoms during their decay.

Uranium and radium are the two radioactive substances.

Explanation:

<h3>Hope it helps you!!</h3>

5 0

2 years ago

How do scientists determine the number of neutrons in an isotope of an atom?

xz_007 [3.2K]

D subtract the atomic number from the atomic mass

N = A - Z

5 0

2 years ago