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3 years ago

A car starting from rest moves with constant acceleration of 2.0 m/s2 for 10 s, then travels with

Physics

1 answer:

12345 [234]3 years ago

6 0

Answer: d = 400 m

Explanation:

Distance during acceleration

d = ½at² = ½(2.0)10² = 100 m

velocity after 10 s

v = 2.0(10) = 20 m/s

distance at constant speed

d = vt = 20(10) = 200 m

As the acceleration is the same magnitude while slowing down as speeding up, It will take the same distance to complete the deceleration 100 m

Total distance is 100 + 200 + 100 = 400 m

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The heat remains constant because there’s nothing to cool it down

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3 years ago

Pulsars are neutron stars that emit X rays and other radiation in such a way that we on Earth receive pulses of radiation from t

stira [4]

Answer:

(a) $a_{c} = 5.41\times 10^{9} m/s^{2}$

(b) $a_{t} = 2.99\times 10^{- 5} m/s^{2}$

Given:

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Spinning time, $t_{s} = 9.50\times 10^{10}$

Solution:

(a) To calculate the value of the centripetal acceleration, $a_{c}$ on the surface of the equator, the force acting is given by the centripetal force:

$m\times a_{c} = \frac{mv_{c}^{2}}{R}$

$a_{c} = \frac{v_{c}^{2}}{R}$ (1)

where

$v_{c} = \frac{distance covered(i.e., circumference)}{ T}$

$v_{c} = \frac{2\pi R}{Time period, T}$ (2)

Now, from (1) and (2):

$a_{c} = R\frac({2\pi )^{2}}{T^{2}}$

$a_{c} = 15000\frac{2\pi )^{2}}{(33.085\times 10^{- 3})^{2}}$

$a_{c} = 5.41\times 10^{9} m/s^{2}$

(b) To calculate the tangential acceleration of the object :

The tangential acceleration of the object will remain constant and is given by the equation of motion as:

$v = u + a_{t}t_{s} = 0$

where

u = $v_{c}$

$a_{t} = - \frac{2\pi R}{Tt_{s}}$

$a_{t} = - \frac{2\pi 15000}{33.085\times 10^{- 3}\times 9.50\times 10^{10}}$

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3 years ago

Consider two parallel wires carrying current in the same direction. Which one of the following statements is true concerning thi

Sedbober [7]

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If current is in direction of your thumb then wrapping of fingers will give the direction of magnetic field.

If two wires with current in same direction flows then the combined magnetic field will be constructive in nature and thus they attract each other.

force on second wire due to first wire is

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4 years ago

Is speed an example of force?

Mars2501 [29]

No. Speed is speed and force is force.

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4 years ago

Jada was walking home for 30 mins. How fast was she walking, if her house is 4 km away fron school?

earnstyle [38]

Answer:

8 km an hour (about 5mph)

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Hope this helped at least a little bit!

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3 years ago