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Butoxors [25]
3 years ago
13

a toy car is wound up and released on the floor. it accelerates at a rate of 0.4 m/s/s . the mass of the care is 3kg. what is th

e force that the cars wheels exert on the floor.
Physics
1 answer:
EastWind [94]3 years ago
8 0

Answer:

1.2N

Explanation:

f=m×a

m=3kg

a=.4m/s/s

3×.4=1.2

kg×m/s/s = N

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An engine is designed to obtain energy from the temperature gradient of the ocean. What is the thermodynamic efficiency of such
rewona [7]

Answer:

0.035 (3.5 %)

Explanation:

The thermodynamic efficiency is given by:

\eta = 1 - \frac{T_C}{T_H}

where

T_C is the cold temperature

T_H is the hot temperature

In this problem we have

T_C = 5 ^{\circ}C+ 273 = 278 KT_H = 15^{\circ}C+273 = 288 K

So the efficiency is

\eta = 1 - \frac{278 K}{288 K}=0.035

6 0
3 years ago
.In real life, a given system can approach equilibrium from different starting points but will still have the same equilibrium c
Degger [83]
<span>It does not matter where the system starts but it will reach to an equilibrium state when the equilibrium ratio is reached.

hope it helps </span>
5 0
3 years ago
A small racquet ball launcher is set up 5 meters from a 12 meter tall wall. It launches a racket ball at 30 m/s at an angle of 4
Strike441 [17]

Answer:20.82 m

Explanation:

Given

distance between wall and launcher=5 m

initial velocity=30 m/s

Launching angle=45^{\circ}

Height of wall=12 m

maximum height by ball

h_{max}=\frac{u^2sin^2\theta }{2g}

h_{max}=\frac{30^2sin^{2}45}{2\times 9.8}

h=22.95 m

y=xtan\theta -\frac{gx^2}{2u^2cos^\theta }

y=4.72 m

so ball will strike with wall

and for perfect restitution final velocity of ball will be same as the horizontal velocity before its impact, only direction will be opposite and vertical velocity will be zero

thus it seems as if someone throw the ball with horizontal velocity of 30cos45 from a height of 4.72

Time required to cover 4.72 m

t=\sqrt{\frac{2h}{g}}

t=\sqrt{\frac{9.45}{9.8}}

t=0.981 s

Horizontal distance traveled in this time

R=ucos45\times t

R=30\times cos45\times 0.981

R=20.82 m

6 0
3 years ago
Which statement describes the chemical property of gold that results in its
LiRa [457]

Answer:

D. It is relatively inert.

Explanation:

8 0
3 years ago
The acceleration due to gravity on the surface of Venus is 8.83 m/s2. An object with a mass of 5.23 kg has what weight on Venus?
Marat540 [252]
Weight = m times g = 5.23 times 8.83 = 46.18 N
6 0
3 years ago
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