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ELEN [110]
3 years ago
12

A electric engine transfers 300j into kinetic energy, 280j into heat energy, and 160j into sound energy. What is the efficiency

of the motor? need help asap
Physics
1 answer:
Tanya [424]3 years ago
4 0

Answer:

42%

Explanation:

Your dividing all the numbers and times themm by 100

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In a ballistics test, a 24 g bullet traveling horizontally at 1200 m/s goes through a 31-cm-thick 320 kg stationary target and e
Zanzabum

Answer:

The  velocity is  v_t  =  0.02175 \  m/s

Explanation:

From the question we are told that

   The  mass of the bullet is  m_b  =  0.024 \  kg

    The initial speed of the bullet is  u_b  =  1200 \  m/s

   The mass of the target is  m_t  =  320 \  kg

    The  initial velocity of target is  u_t  =  0  \ m/s

    The  final velocity of the bullet is  is  v_b  =  910 \  m/s

   

Generally according to the law of momentum conservation we have that

      m_b *  u_b  +  m_t *  u_t  =  m_b *  v_b  +  m_t  *  v_t

=>   0.024  *  1200  +  320 *  0  =  0.024 *  910   +  320  *  v_t

=>    v_t  =  0.02175 \  m/s

3 0
3 years ago
What happens when two positive charges are near each other?
Westkost [7]
If two positive charges are near each other they will repel each other.
7 0
3 years ago
A 3.6kg mass is accelerated at 2.5m/s. Calculate the resultant force<br> acting on it.
AleksandrR [38]
Force = mass*acceleration so
3.6*2.5 =9 Newtons
5 0
3 years ago
Please help! I will give brainliest! Also can you please explain why it’s that answer. Thanks!
Veronika [31]

Answer:

B

Explanation:

Forces are pushes or pulls. They can be balanced or unbalanced. If unbalanced they can change the shape of objects and change the way they are moving (speed-wise)

5 0
3 years ago
What voltage produces a 6-A current in a circuit thhat has a total resistance of 3 Ω ?
-Dominant- [34]
The equation we need to use is Ohm's Law

Voltage = Current * Resistance

Voltage = 6A * 3<span>Ω = 18 Volts</span>
7 0
3 years ago
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