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babymother [125]

3 years ago

7

an object is acted upon by a force of 23 newton’s to the right and a force of 13 newton’s to the left. what is the magnitude and

direction of the net force?

1 answer:

Marysya12 [62]3 years ago

5 0

10 Newtons to the right

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Throw two balls from the same height at the same time at an initial speed of 20 m/s. One is thrown vertically down, while the ot

labwork [276]

The time difference between their landing is 2.04 seconds.

<h3>Time of difference of the two balls</h3>

The ball thrown vertical upwards will take double of the time taken by the ball thrown vertically downwards.

Time difference, = 2t - t = t

t = √(2h/g)

where;

h is the height of fall
g is acceleration due to gravity

Apply the principle of conservation of energy;

¹/₂mv² = mgh

h = v²/2g

where;

v is speed of the ball

h = (20²)/(2 x 9.8)

h = 20.41 m

<h3>Time of motion</h3>

t = √(2 x 20.41 / 9.8)

t = 2.04 s

Thus, the time difference between their landing is 2.04 seconds.

Learn more about time of motion here: brainly.com/question/2364404

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6 0

2 years ago

A Carnot engine has an efficiency of 0.537, and the temperature of its cold reservoir is 379 K.

katen-ka-za [31]

Answer:

(A) Th = 818.6 K

(B) Qh = 14211.7 J

Explanation:

efficiency (n) = 0.537

temperature of cold reservoir (Tc) = 379 K

heat rejected (Qc) = 6580 J

(A) find the temperature of the hot reservoir (Th)

n = 1 - $\frac{Tc}{Th}$

0.537 = 1 - $\frac{379}{Th}$

$\frac{379}{Th}$ = 1 - 0.537 = 0.463

Th = $\frac{379}{0.463}$

Th = 818.6 K

(B) what amount of heat is put into the engine (Qh) ?

from $\frac{Tc}{Th} = \frac{Qc}{Qh}$

Qh = 6580 ÷ $\frac{379}{818.6}$

Qh = 14211.7 J

8 0

3 years ago

When an RL circuit is connected to a battery, which is true about its initial and final states?

zubka84 [21]

Answer:A

Explanation:

In R-L circuit current is given by

$i=i_0\left [ 1-e^{\frac{-t}{L/R}}\right ]$

where i=current at any time t

$i_0=maximum\ current$

R=resistance

L=Inductance

at t=0 $e^{\frac{-t}{L/R}}$ approaches to 1

therefore $i=i_0\left [ 1-1\right ]$

i=0

when t approaches to $\infty$ , $e^{\frac{-t}{L/R}}$ approaches to zero

thus $i=i_0$

thus we can say that initially circuit act as broken wire with zero current

and it increases exponentially with time and act as ordinary connecting wire

7 0

4 years ago

The position of an ant and a spider in a room are A(2,3,5) and B(6,0,8) determine the distance

marta [7]

Answer:

$|d| = \sqrt{ {(x_{2} -x_{1})}^{2} + {(y_{2} -y_{1})}^{2} + {(z_{2} -z_{1})}^{2}} \\ = \sqrt{ {(6 - 2)}^{2} + {(3 - 0)}^{2} +{(5 - 8)}^{2} } \\ = \sqrt{16 + 9 + 9} \\ = \sqrt{34}$

4 0

3 years ago

What is projectile motion

Georgia [21]

pls follow me

Explanation:

A projectile is an object upon which the only force is gravity. The horizontal motion of the projectile is the result of the tendency of any object in motion to remain in motion at constant velocity. Due to the absence of horizontal forces, a projectile remains in motion with a constant horizontal velocity.

4 0

3 years ago

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