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3 years ago

A toy car accelerates from 3m/s to 5m/s in 5sec . what is the acceleration

Physics

1 answer:

san4es73 [151]3 years ago

7 0

Answer:

0.4

Explanation:

Because 3m/s is the initial velocity(u) and 5m/s is the final velocity(v) and time is 5 sec.

So, acceleration = v-u ÷ t

I'm confused

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A mass of 1 kg is moving in a circle of radius 3.3 meters. What is the liner velocity v m/s that would give a Centripetal Force

Ghella [55]

Answer:

The linear velocity of the object is 8.71 m/s.

Explanation:

Given;

mass of the object, m = 1 kg

radius of the circle, r = 3.3 meters

centripetal force, F = 23 N

Centripetal force is given by;

$F_c = \frac{mv^2}{r}\\\\$

where;

v is the linear velocity of the object

$F_c = \frac{mv^2}{r}\\\\mv^2 = F_cr\\\\v^2 = \frac{F_cr}{m}\\\\v= \sqrt{\frac{F_cr}{m}} \\\\v= \sqrt{\frac{23*3.3}{1}}\\\\v = 8.71 \ m/s$

Therefore, the linear velocity of the object is 8.71 m/s.

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3 years ago

You throw a rock upward. The rock is moving upward, but it is slowing down. If we define the ground as the origin, the position

lyudmila [28]

Answer:

A. Positive, positive

Explanation:

As we defined the ground is the origin, as long as the rock is above the ground, its position would always be positive.

As for velocity, as long as the rock is moving upwards, its direction is also upward, so its velocity is always positive. The velocity will become negative when the rock falls down.

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3 years ago

A rocket with a weight of 8,000 N is accelerated vertically at 12.0 m/s/s.

sergeinik [125]

Quit cheating and figure it out your self, the app wasn’t made to cheat it was made to help.

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2 years ago

A 6.50-g sample of copper metal at 25.0°C is heated by the addition of 84.0 J of energy. The final temperature of the copper is

Mekhanik [1.2K]

Answer:

Final temperature of the copper is 59 degrees Celsius

Explanation:

It is given that,

Mass of the sample of copper metal, m = 6.5 g

Initial temperature of the metal, $T_i=25^{\circ}\ C=298\ K$

Heat generated, Q = 84 J

The specific heat capacity of liquid water is 0.38 J/g-K

Let $T_f$ is the final temperature of the copper. It can be calculated using the definition of specific heat of any substance. It is given by :

$Q=mc\Delta T$

$Q=mc(T_f-T_i)$

$T_f=\dfrac{Q}{mc}+T_i$

$T_f=\dfrac{84}{6.5\times 0.38}+298$

$T_f=332\ K$

$T_f=59^{\circ}C$

So, the final temperature of the copper is 59 degrees Celsius. Hence, this is the required solution.

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3 years ago

Green light can have a wavelength of 512 nm. The energy of a photon of this light is

Nat2105 [25]

Answer:

$E = 3.88 * 10^{-17} J$

Explanation:

Energy is directly proportional to frequency and it is given as:

E = hf

where h = Planck's constant

f = frequency

To get frequency, we use the formula of speed:

c = λf

where c = speed of light

λ = wavelength

=> f = c/λ

Therefore, the energy of the photon will be:

E = hc/λ

$E = \frac{6.626 * 10^{-34} * 3 * 10^{8} }{512 * 10^{-9} }$

$E = 3.88 * 10^{-17} J$

The energy of the photon is $3.88 * 10^{-17} J$

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3 years ago

A toy car accelerates from 3m/s to 5m/s in 5sec . what is the acceleration​

A toy car accelerates from 3m/s to 5m/s in 5sec . what is the acceleration