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astraxan [27]
3 years ago
10

A rabbit is hopping along at an approximately constant speed of 3.9 m/s. The rabbit passes a crouched cat ready to chase the rab

bit. The cat takes off the instant the rabbit passes the cat, accelerating at 0.5 m/s2. How long does it take the cat to catch the rabbit
Physics
1 answer:
Firlakuza [10]3 years ago
4 0

Answer:

t  = 7,8 s

Explanation:

From the instant, the rabbit passes the cat. The cat star running acceleration of 0,5 m/s² .

When the cat arrives at the speed of 3,9 m/s the cat catches the rabbit

Then for the cat arrives at 3,9 m/s nedds

v = vo + a*t     vo  = 0  then   v = a*t

3,9 ( m/s) = 0,5 ( m/s² ) * t

t  = 7,8 s

v  =  3,9 m/s =

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Biologists use optical tweezers to manipulate micron-sized objects using a beam of light. In this technique, a laser beam is foc
sleet_krkn [62]

Answer:

a)   I = 1,894 10¹⁰ W / m², b)  E = 1.376 10⁵ N / C

Explanation:

a) intensity is defined as energy per unit area per unit time

          I = P / A

let's reduce the magnitudes to the SI system

         P = 10 mW = 10 10⁻³ W

         d = 0.82 μm = 0.82 10⁻⁶ m

the laser area is

         A =π r² = π d²/4

         A =π (0.82 10⁻⁶)²/4

         A = 5.28 10⁻¹³ m²

we calculate

          I = \frac{10 \ 10^{-3}}{5.28 \ 10^{-13}}

          I = 1,894 10¹⁰ W / m²

b) average intensity and electric field are related

          I = E * E

          E = √I

          E = \sqrt{1.894 \ 10^{10}}

          E = 1.376 10⁵ N / C

4 0
3 years ago
What two things keeps the planets, asteroids, comets and moons in orbit?
gregori [183]
Answer:

The sun's gravity pulls the planet toward the sun, which changes the straight line of direction into a curve. This keeps the planet moving in an orbit around the sun. Because of the sun's gravitational pull, all the planets in our solar system orbit around it.
5 0
3 years ago
Read 2 more answers
The concrete sections of a certain superhighway are designed to have a length of 23.0 m. The sections are poured and cured at 10
loris [4]

Answer:

0.88 cm

Explanation:

Initial length at 10°c, L = 23 m

Rise of temperature, Δt = 42 - 10 = 32°c

Coefficient of linear expansion of concrete, α = 12 x 10^(-6) per°c

Minimum spacing to be left = α L Δt

=12\times10^{-6}\times23\times32

=8.832\times10^{-3}m

= 8.832 x 10^{-1} cm

= 0.88 cm

Note: I have a chosen a general value of 12 x 10^-6 per deg c for coefficient of expansion of  concrete. However, please refer to the value given in your text book and substitute it for an accurate answer.

8 0
3 years ago
1. El puente mas largo del mundo es el puente Akashi Kaikyo, en Japón. El puente mide 3910 m de largo y está construido con acer
bearhunter [10]

Answer:

It's 1.0000042 times longer in summer than in winter. It represents a 1.6 centimeters difference between seasons.

Explanation:

The linear coefficient of thermal expansion for steel is about 1.2*10^{-7}\°C^{-1}. From the equation of linear thermal expansion, we have:

L_f=L_0(1+\alpha\Delta T)

Taking the winter day as the initial, and the summer day as the final, we can take the relationship between them:

L_{summer}=L_{winter}[1+(1.2*10^{-7}\°C^{-1})(30\°C+5\°C)]\\\\L_{summer}=(1.0000042)L_{winter}

It means that the bridge is 1.0000042 times longer in summer than in winter. If we multiply it by the length of the bridge, we obtain that the difference is of about 1.6 centimeters between the two seasons.

8 0
4 years ago
What might happen if you consumed too many lipids
krek1111 [17]
Lipids, aka, fats and oils consumed in excesses makes you extremely fat and gives you obesity. The most known example of this is america   
6 0
4 years ago
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