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Stells [14]
3 years ago
7

do u ever think that how are u living cause we could not even be here and God but made us but had did it all started I believe i

n god btw I'm just saying how
Physics
1 answer:
Katena32 [7]3 years ago
5 0

Answer:

What is the question

Explanation:

lol

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A car is travelling at 15 m/s on a horizontal road and stopped after 4 s. The coefficient of kinetic friction between the tires
givi [52]

Answer:

Fr,= umg

umg= ma

a= v/t

umg= mv/t

u= v/gt= 0.38

3 0
3 years ago
A 2.0 µF capacitor is charged through a 50,000 ohm resistor. How long does it take for the capacitor to reach 90% of full charge
Nesterboy [21]

Answer:

0.23 s

Explanation:

First of all, let's find the time constant of the circuit:

\tau=RC

where

R=50,000 \Omega is the resistance

C=2.0\mu F=2.0\cdot 10^{-6}F is the capacitance

Substituting,

\tau=(50,000 \Omega)(2.0\cdot 10^{-6}F)=0.1 s

The charge on a charging capacitor is given by

Q(t)=Q_0 (1-e^{-t/\tau} ) (1)

where

Q_0 is the full charge

we want to find the time t at which the capacitor reaches 90% of the full charge, so the time t at which

Q(t)=0.90 Q_0

Substituting this into eq.(1) we find

0.90 Q_0 = Q_0 (1-e^{-t/\tau})\\0.90=1-e^{-t/\tau}\\e^{-t/\tau}=1-0.90=0.10\\-\frac{t}{\tau}=ln(0.10)\\t=-\tau ln(0.10)=(0.1 s)ln(0.10)=0.23 s

4 0
3 years ago
On a farm, you are pushing on a stubborn pig with a constant horizontal force with magnitude 30.0 n and direction 37.0° counterc
sashaice [31]

<span>Since the force is applied at an angle from the horizontal, we will use the horizontal component of this force in calculating for the displacements.
From derivation, the Fx is:</span>

Fx = F cos φ

Where:

Fx = is the horizontal component of the force

F = total force

φ = angle in radian = 37 * pi / 180 = 0.645 rad

Calculating: Fx = 30.0 N * cos(0.645)

Fx = 23.97 N = 24 N

Calculating for Work: W = Fx * d

A. W = 24 N * 15 m = 360 N

B. W = 24 N * 16 m = 384 N

C. W = 24 N * 12 m = 288 N

D. W = 24 N * 14 m = 336 N 

8 0
3 years ago
A ball is dropped from the roof of a 25-m-tall building. What is the velocity of the object when it touches the ground? Suppose
Wewaii [24]

Answer:

a)  h=25m

b)  v=19.8m/sec

Explanation:

From the question we are told that:

Height h=25m

Bounce Height h'=20m

Generally the Kinematic equation is mathematically given by

V=\sqrt{2gh}\\\\V=\sqrt{2*9.81*25}

V=22.1m/sec

Therefore Height

h=\frac{V^2}{2g}\\\\h=\frac{22.1^2}{2*9.81}

h=25m

b)

Generally the Kinematic equation is mathematically given by

v^2=2ah

v^2=2*9.8*20

v=\sqrt{2*9.8*20}

v=19.8m/sec

3 0
3 years ago
What is the relationship between the force and the period in a mass hanging on a spring oscillation and why?
BabaBlast [244]

Explanation:

Period of a mass on a spring is:

T = 2π√(m/k)

T is a function of only m and k.  So the period is independent of force.

5 0
3 years ago
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