Ask question

Ask question

All categories

4 years ago

9

A mechanic pushes a 3.60 âœ• 103-kg car from rest to a speed of v, doing 5,130 j of work in the process. during this time, the c

ar moves 21.0 m. neglecting friction between car and road, find v and the horizontal force exerted on the car. (a) the speed v

1 answer:

Mkey [24]4 years ago

8 0

Are there any answer choices?

You might be interested in

To practice Problem-Solving Strategy 22.1: Gauss's Law.An infinite cylindrical rod has a uniform volume charge density rho(where

d1i1m1o1n [39]

Answer:

Solution for 3 different cases are given in explanation.

Explanation:

Gauss's Law:

$\int_S E.dA=Q_{encl}/\epsilon_0$

for $r$ :

$E.2\pi rL=\frac{\rho\pi r^2L/\pi r_0^2}{\epsilon_0} \\\\E=\frac{\rho r}{2\pi\epsilon_0 r_0^2}$

for $r=r_0$ :

$E.2\pi r_0L=\frac{\rho\pi r_0^2L}{\epsilon_0} \\\\E=\frac{\rho r_0}{2\epsilon_0}$

for $r>r_0$ :

$E.2\pi rL=\frac{\rho\pi r_0^2L}{\epsilon_0} \\\\E=\frac{\rho r_0^2}{2\epsilon_0 r}$

8 0

3 years ago

Assume that the average mass of each of the approximately 1 billion people in China is 55 kg.Assume that they all gather in one

Harman [31]

Answer: $5.9(10)^{-8} m$

Explanation:

The equation to calculate the center of mass $C_{M}$ of a particle system is:

$C_{M}=\frac{m_{1}r_{1}+m_{1}r_{1}+...+m_{n}r_{n}}{m_{1}+m_{2}+...+m_{n}}$

In this case we can arrange for one dimension, assuming the geometric center of the Earth and the ladder are on a line, and assuming original center of mass located at the Earth's geometric center:

$C_{M}=\frac{m_{E}(0 m) + m_{p} r_{E-p}}{m_{E}+m_{p}}$

Where:

$m_{E}=5.9(10)^{24} kg$ is the mass of the Earth

$m_{p}=55(10)^{9} kg$ is the mass of 1 billion people

$r_{E}=6371000 m$ is the radius of the Earth

$r_{E-p}=6371000 m- 2m=6370998 m$ is the distance between the center of the Earth and the position of the people (2 m above the Earth's surface)

$C_{M}=\frac{m_{p}55(10)^{9} kg (6370998 m)}{5.9(10)^{24} kg+55(10)^{9} kg}$

$C_{M}=5.9(10)^{-8} m$ This is the displacement of Earth's center of mass from the original center.

8 0

3 years ago

Use the following table of a school bus during morning pickups to calculate its average speed between 0 h and 2.34 h

egoroff_w [7]

Position: 1.17, Time: 0.234

7 0

3 years ago

Read 2 more answers

f1=30Nandf2=10Nact on amass of 2kg if the cofficient of friction between the mass and the horizontal surface is 0.2 what is the

Alexus [3.1K]

The mass is moving with an acceleration of 13.299 m/s².

<h3>What is the straight forward meaning of acceleration?</h3>

The rate at which an object's velocity with respect to time changes is referred to as acceleration in mechanics. They are vector quantities, accelerations.

According to therefore mentioned statement,

the direction of the net force applied on an object determines its acceleration;

according to mentioned data;

F₁=30N

F₂=10N

Net force on object;

F=F₁+F₂

F=F₁y+F₂Cos30°(-x)+F₂ Sinx(-y)

F=3y+10×(√3/2)(-x)+10×(1/2)(-y)

F=ma

ma=-5√3/2(x)+25y

2a=-5√3x/2+25y

a=-5√3x+25y

magnitude(a)=√(-5√3/2)²+(25/2)²

(a) =13.299m/s²

to know more about acceleration visit;

brainly.com/question/15295474

#SPJ9

6 0

2 years ago

Why do windows of distant houses appear to reflect the sun only when rising or setting

alisha [4.7K]

<span> most importantly, the sun is reflected back at the same angle as the angle of incidence, so with vertical panes of glass and the sun overhead, the reflection will just hit the ground before traveling any distance. </span>

3 0

3 years ago

Read 2 more answers