1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
almond37 [142]
4 years ago
12

A truck is moving with a certain uniform velocity. It is accelerated uniformly by 0.75 m/s^2. After 20 seconds , the velocity be

comes 72km/h.Find the initial velocity
Physics
1 answer:
scoundrel [369]4 years ago
5 0

Answer:

Vi = 5 m/s

Explanation:

let (a) acceleration = 0.75 m/s²

(t) time = 20 seconds

Vf = final velocity = 72 km/hr  (convert to m/s to units consistency = 20 m/s)

find Initial velocity (Vi)

       Vf - Vi

a =  -----------

             t

Vi = Vf - (a * t)  = 20 - (0.75 * 20)

Vi = 5 m/s

You might be interested in
A falling back in mid air has what
Umnica [9.8K]
Acceleration I think if I’m not mistaken
4 0
4 years ago
A charged capacitor is connected to an ideal inductor to form an LC circuit with a frequency of oscillation f = 1.6 Hz. At time
IrinaK [193]

Answer:

8.0\mu C

Explanation:

We are given that

f=1.6 Hz

q=3.0\mu C=3.0\times 10^{-6} C

1\mu C=10^{-6} C

Current,I=75\mu A=75\times 10^{-6} A

1\mu A=10^{-6} A

We have to find the maximum charge of the capacitor.

Charge on the capacitor,q=q_0cos\omega t

\omega=2\pi f=2\pi\times 1.6=3.2\pi rad/s

3\times 10^{-6}=q_0cos3.2\pi t....(1)

I=\frac{dq}{dt}=-q_0\omega sin\omega t

75\times 10^{-6}=-q_0(3.2\pi)sin3.2\pi t....(2)

Equation (2) divided by equation (1)

-3.2\pi tan3.2\pi t=\frac{75\times 10^{-6}}{3\times 10^{-6}}=25

tan3.2\pi t=-\frac{25}{3.2\pi}=-2.488

3.2\pi t=tan^{-1}(-2.488)=-1.188rad

q_0=\frac{q}{cos\omega t}=\frac{3\times 10^{-6}}{cos(-1.188)}=8.0\times 10^{-6}=8\mu C

Hence, the maximum charge of the capacitor=8.0\mu C

4 0
4 years ago
A certain aircraft can fly 612 miles with the wind in 3 hours and travel the same distance against the wind in 6 hours. What is
Andreas93 [3]

Answer:

51 mph

Explanation:

Given: A certain aircraft can fly 612 miles with the wind in 3 hours and travel the same distance against the wind in 6 hours.

Formula: Speed=\dfrac{Distance}{Time}

Let speed of aircraft be x mph and speed of wind y mph

Aircraft along wind:

Actual speed of aircraft = x + y

                    Time taken = 3 hours

                        Distance = 612 miles

\therefore x+y=\dfrac{612}{3}

x+y=204----------(1)

Aircraft against wind:

Actual speed of aircraft = x - y

                    Time taken = 6 hours

                        Distance = 612 miles

\therefore x-y=\dfrac{612}{6}

x-y=102----------(2)

By solving equation (1) and equation (2) and we get

x = 153 mph

y =  51 mph

Hence, The speed of wind will be 51 mph

6 0
3 years ago
A boy pushes a 54kg cart with a force of 81N. What is the cart's acceleration?
borishaifa [10]

Explanation:

maturity also get disorganised

8 0
3 years ago
A simple pendulum 50 oscillations 22.3s find its period​
Harman [31]

Answer:

22.3s / 50 =0.446s

Explanation:

6 0
3 years ago
Other questions:
  • Question 3 of 10
    9·2 answers
  • If the specific heat of water is 1.0 calorie/gram°C, how many calories are required to raise 500 grams of water 10.0°C? 510 cal
    5·2 answers
  • What protect and support the cell in a animal cell
    15·2 answers
  • An electron de-excites from the fourth quantum level to the third and then directly to the first. Two frequencies of light are e
    9·1 answer
  • Which undergoes the greatest change in momentum: (a) a baseball that is caught, (b) a baseball that is thrown, or (c) a baseball
    13·1 answer
  • Noah stands 170 meters away from a steep canyon wall. He shouts and hears the echo of his voice one second later. What is the sp
    9·1 answer
  • Five different forces act on an object. Is it possible for the net force on the object to be zero?
    9·1 answer
  • How did the iron filing patterns show attractive forces between magnetic poles?
    15·2 answers
  • What energy is this in the image
    9·2 answers
  • A wave created by shaking a rope up and down is called a.
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!