3 years ago

HELP PLZ [Kinetic and Potential Energy]

Physics

1 answer:

Oliga [24]3 years ago

4 0

Answer:

ok its 58

Explanation:

yes

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place the compass at one pole of the bar magnet click flip polarity in the menu what happens to the bar magnet and the compass n

Elanso [62]

Answer:

The two poles of the bar magnet change positions. The compass needle spins a half circle.

Explanation:

4 0

3 years ago

If a moving car speeds up until it is going twice as fast, how much kinetic energy doe s it have compared with its initial kinet

dezoksy [38]

The kinetic energy of an object of mass m and velocity v is given by
$K= \frac{1}{2} mv^2$

Let's call $v_i$ the initial speed of the car, so that its initial kinetic energy is
$K_i = \frac{1}{2} mv_i^2$
where m is the mass of the car.

The problem says that the car speeds up until its velocity is twice the original one, so
$v_f = 2 v_i$
and by using the new velocity we can calculate the final kinetic energy of the car
$K_f = \frac{1}{2} mv_f^2 = \frac{1}{2}m (2 v_i)^2 = 4 ( \frac{1}{2} mv_i^2)=4 K_i$
so, if the velocity of the car is doubled, the new kinetic energy is 4 times the initial kinetic energy.

6 0

3 years ago

calculate the frequency and time period of sound wave of 35 m wave length propagating at a speed of 3500m/s

zheka24 [161]

Answer:

Frequency = 100 Hz

Time period = 0.01 sec

Explanation:

f= 3500/35 = 100

T = 1/f = .01

5 0

3 years ago