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LUCKY_DIMON [66]
3 years ago
13

What is the net force​

Physics
1 answer:
nadya68 [22]3 years ago
3 0

Answer:

20 N in West direction.

Explanation:

opposite forces cancel each other. so 20 N in north and 20N in south cancel each other. In west and east direction...

70N in west-50N in east= 20N in west

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Natural selection allows populations to (2 points)
Dahasolnce [82]
<span>
adapt to a changing environment

</span><span>organisms that possess heritable traits that enable them to better adapt to their environment </span>
3 0
3 years ago
A swan on a lake gets airborne by flapping its wings and running on top of the water. If the swan must reach a velocity of 6.00
ira [324]

Answer:

A. 51.42 m.

B. 17.14 s.

Explanation:

Using equations of motion:

vf^2 = vi^2 + 2 * aS

Where,

vf = final velocity

a = acceleration

S = distance to which swan traveled

vi = 0 m/s

6.00^2 = 2 * 0.350S

S = 36/0.7

= 51.42 m.

B.

vf = vi + at

6 = 0 + 0.35t

t = 6/0.35

= 17.14 s.

5 0
3 years ago
Bill steps off a 3.0-m-high diving board and drops to the water below. At the same time, Ted jumps upward with a speed of 4.2 m/
Pani-rosa [81]

Answer:

equation of  motion for Bill is

y(t) = 4.9t^2

equation of  motion for Ted is

y(t) = 2 + (-4.2)(t) + 4.9t^2

Explanation:

Taking downward position positive and upward position negative

g = 9.8 m/s^2

equation of  motion for Bill is

y(t) = y_0 +v_0 t +\frac{1}{2}gt^2

y(t) = 0 + 0(t) +\frac{1}{2}gt^2

y(t) = \frac{1}{2}\times (9.8t)^2

y(t) = 4.9t^2

equation of  motion for Ted is

y_0 = 2m -1m = 2m

y_0 = -4.2 m/s

y(t) = y_0 +v_0 t +\frac{1}{2}gt^2

y(t) = 2 + (-4.2)(t) +\frac{1}{2}gt^2

y(t) = 2 + (-4.2)(t) +\frac{1}{2}\times (9.8t)^2

y(t) = 2 + (-4.2)(t) + 4.9t^2

8 0
3 years ago
Read 2 more answers
A car came to a stop from a speed of 35 m/s in a time of 8.1 seconds. What was the acceleration of the car?
uranmaximum [27]
Simply subtract the two velocities and divide by 8.1,

\frac{0 - 35}{8.1} = - 4.32

~~

I hope that helps you out!!

Any more questions, please feel free to ask me and I will gladly help you out!!

~Zoey
5 0
3 years ago
Read 2 more answers
Technetium (Tc; Z = 43) is a synthetic element used as a radioactive tracer in medical studies. A Tc atom emits a beta particle
LenKa [72]

Answer : The de-Broglie wavelength of this electron, 0.101\AA

Explanation :

The formula used for kinetic energy is,

K.E=\frac{1}{2}mv^2        ..........(1)

According to de-Broglie, the expression for wavelength is,

\lambda=\frac{h}{mv}

or,

v=\frac{h}{m\lambda}      ...........(2)

Now put the equation (2) in equation (1), we get:

\lambda=\frac{h}{\sqrt{2\times m\times K.E}}  ...........(3)

where,

\lambda = wavelength = ?

h = Planck's constant = 6.626\times 10^{-34}Js

m = mass of electron = 9.11\times 10^{-31}Kg

K.E = kinetic energy = 4.71\times 10^{-15}J

Now put all the given values in the above formula (3), we get:

\lambda=\frac{6.626\times 10^{-34}Js}{\sqrt{2\times 9.11\times 10^{-31}Kg\times 4.71\times 10^{-15}J}}

\lambda=1.0115\times 10^{-11}m=0.101\AA

conversion used : (1\AA=10^{-10}m)

Therefore, the de-Broglie wavelength of this electron, 0.101\AA

7 0
3 years ago
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