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lina2011 [118]
3 years ago
9

A car accelerates from rest (v. 0 m/s) with a constant acceleration of

Physics
1 answer:
oksano4ka [1.4K]3 years ago
4 0

Heya!!

For calculate final velocity, lets applicate formula

                                                \boxed{V=V_o+a*t}

                                                 <u>Δ   Being   Δ</u>

                                            V = Final Velocity = ?

                                         Vo = Initial velocity = 0 m/s

                                          a = Aceleration = 5 m/s²

                                                 t = Time = 12 s

⇒ Let's replace according the formula:

\boxed{V=0\ m/s +5\ m/s*12\ s}

⇒ Resolving

\boxed{V=60\ m/s}

Result:

The velocity after 10 sec is <u>60 meters per second (m/s)</u>

Good Luck!!

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A 140 g baseball is moving horizontally to the right at 35 mis when it is hit by the bat. the ball fl ies off to the le ft at 55
Anit [1.1K]

Answer:

J = 12.32kg*m/s

Explanation:

Assumptions: I'm assuming mis is m/s

Given: The baseball's mass is 140g, so convert to kg, 0.140kg. (Good rule of thumb, in physics convert grams to kilograms). It is initially traveling 35 m/s to the right.

When it hits the bat, it flies left with a velocity of 55 m/s at an angle of 25°. To reiterate:

mass = 0.140kg, Initial: 35m/s, Final: 55m/s at an angle of 25°

For this problem, we have to use the impulse equation, but before that lets break the velocity into components (It will be apparent towards the end):

The initial velocity is moving only in the horizontal direction, so:

v_{0x} = 35 m/s

The final velocity has an x and a y component:

v_{fx} = 55cos(25) = 49.84692829m/s\\v_{fy} = 55sin(25) = 23.2440044m/s

Now the equation for impulse is (dp is Δp, which is difference in momentum; dv is Δv, the difference in velocity; J is impulse):

J = dp= m*dv

To get Δv, we have to find the difference of velocity, that is why we broke it into components. I'm going to define right as positive and left as negative. After that, we find the velocity vector:

dv_{x} = (35-(-49.84692829)) = 84.84692829 m/s\\dv_{y} = (0-(23.2440044)) = -23.2440044 m/s\\dv = \sqrt{(84.84692829)^2+(-23.2440044)^2} = 87.97320604m/s

Finally, substitute into the equation

J = m*dv\\J = 0.140kg * 87.97320604m/s\\J = 12.31624885kg*m/s\\J = 12.32 kg*m/s

J = 12.32kg*m/s

8 0
3 years ago
A transformer with 1000 turns on the primary coil is used to decrease the voltage from 2500 V to 120 V for home use. How many tu
Katyanochek1 [597]

Answer:

The number of turns in the secondary coil is 48.

(B) is correct option.

Explanation:

Given that,

Number of turns on primary coil= 1000

Primary voltage = 2500 V

Secondary voltage = 120 v

We need to calculate the turns  in the secondary coil

Using relation between voltage and number of turns in primary and secondary coil

\dfrac{V_{s}}{V_{p}}=\dfrac{N_{s}}{N_{p}}

Put the value into the formula

\dfrac{120}{2500}=\dfrac{N_{s}}{1000}

N_{s}=\dfrac{120}{2500}\times1000

N_{s}=48\ turns

Hence, The number of turns in the secondary coil is 48.

5 0
4 years ago
A machine has a mechanical advantage of 5. What force should be applied to the machine to make it apply 3000 N to an object?
ziro4ka [17]
The answer to this very question is 3000n
6 0
3 years ago
Read 2 more answers
. How does the intensity of sunlight received affect Earth’s temperatures?
leonid [27]
When the sun's rays strike Earth's surface near the equator, the incoming solar radiation is more direct (nearly perpendicular or closer to a 90˚ angle). Therefore, the solar radiation is concentrated over a smaller surface area, causing warmer temperatures.
7 0
3 years ago
Please help me !!
avanturin [10]
The correct answer is B
5 0
3 years ago
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