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2 years ago

9

In which direction will the object accelerate?

1 answer:

Tatiana [17]2 years ago

7 0

Answer:

D. Upward and to the left

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A liquid has a volume of 100 cm and a mass of 85g.

djyliett [7]

Answer:

B. Its density is lower than that of water

Explanation:

density = mass / volume

density of the liquid = 85 / 100 = 0.85 g/cm^3

now,

density of water is 1 g/cm^3 which is greater than the density of the given liquid ( 0.85 g/cm^3 )

6 0

2 years ago

A crew on a spacecraft watches a movie that is two hours long. The spacecraft is moving at high speed through space. An Earth-ba

laiz [17]

Answer:

The duration of the movie is longer than 2 hrs.

Explanation:

Given:

The duration of the movie observed by the crew on the spacecraft is 2 hrs.

According to time-dilation formula:

$t = \dfrac{t_{0}}{\sqrt{1 - \dfrac{v^{2}}{c^{2}}}}$

Here, $t$ is the required time, $t_{0}$ is the original time, $v$ is the velocity of the spacecraft and $c$ is the velocity of light.

Since $v$ , so $t_{0} > t$ .

So the time required will be large.

4 0

2 years ago

A pendulum takes 4 seconds to make one complete swing. A man walks 100m in a straight line while the pendulum makes 20 complete

irina [24]

The average velocity of the man is determined as 1.25 m/s.

<h3>Average velocity of the man</h3>

Total distance traveled by the man = 100 m

If 1 complete cycle = 4 s

20 complete cycle = ?

= 20 x 4 s

= 80 s

Average velocity = total distance/total time

Average velocity = 100 m/80 s

Average velocity = 1.25 m/s

Thus, the average velocity of the man is determined as 1.25 m/s.

Learn more about average velocity here: brainly.com/question/6504879

#SPJ1

4 0

1 year ago

An electric field of 2.09 kV/m and a magnetic field of 0.358 T act on a moving electron to produce no net force. If the fields a

My name is Ann [436]

Answer:

The velocity is $v = 5838 \ m/s$

Explanation:

From the question we are told that

The electric field is $E = 2.09 kV/m = 2.09 *10^{3} \ V/m$

The magnetic field is $B = 0.358 \ T$

Generally the force experienced by the electron due to the magnetic field is

$F_m = qvB$

Generally the force experienced by the electron due to the electric field is

$F_e = qE$

Since from the question the net force is zero then

$F_e = F_m$

=> $v = \frac{E}{B}$

Substituting values

$v = \frac{2.09*10^{3}}{0.358 }$

$v = 5838 \ m/s$

8 0

2 years ago

the two ropes are used to vertically lower a 255 kg piano from exactly 4 m form a seocnd sotry window to the ground how much wor

Ilya [14]

Complete Question

The Question diagram is attached below

Answer:

a) $W_{Fg}= 12500 Nm$

b) $W_{T_1}= - 6339.3Nm$

c) $W_{T_2}= - 3662.8Nm$

Explanation:

From the question we are told that:

Mass $m=255kg$

Distance $d=4m$

Generally the equation for Work done is mathematically given by

$W=F*d$

For $F_g$

$W_{Fg}=2500 x 5.3$

$W_{Fg}= 12500 Nm$

For $T_1$

$W_{T_1}= - {1830 sin(60) x 4}$

$W_{T_1}= - 6339.3Nm$

For $T_2$

$W_{T_2}= - {1295 sin(45) x 4}$

$W_{T_2}= - 3662.8Nm$

6 0

2 years ago