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4 years ago

What is the change in the ball's position from t=0s to t=1.0s? express your answer using two significant figures?

1 answer:

3 0

The change in position is the change of the position of the ball from initial to final. In this problem, we are given the initial position of the ball which is t=0s and the final position which is t=1.0s. Thus, the change in the ball's position from 0 to 1 second is 4.0 m

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You are pushing a 20-kg box along a horizontal floor. Friction acts on the box. When you apply a horizontal force of magnitude 4

LenKa [72]

Answer:

$a = 2.6\,\frac{m}{s^{2}}$

Explanation:

The first box has the following equation of equilibrium:

$\Sigma F = F - f = 0$

$f = F$

$f = 48\,N$

The coefficient of friction is:

$\mu_{k} = \frac{f}{m \cdot g}$

$\mu_{k} = \frac{48\,N}{(20\,kg)\cdot (9.807\,\frac{m}{s^{2}} )}$

$\mu_{k} = 0.245$

There is a net acceleration, when horizontal pushing force is increased:

$\Sigma F = F - f = m\cdot a$

$a = \frac{F-f}{m}$

$a = \frac{100\,N-48\,N}{20\,kg}$

$a = 2.6\,\frac{m}{s^{2}}$

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3 years ago

Read 2 more answers

Vector a cross b whole square

skad [1K]

Answer:

Kriss go Brrrrrrrrrrr

Explanation:

4 0

3 years ago

Lamp power with 120 W what is the current through the lamp when it is connected to a 12 V battery ?

SVETLANKA909090 [29]

Answer:

current = 10A

Explanation:

recall the formula, Power = current * voltage

120 W = current * 12V

current (A) = 120 W / 12V

current = 10A

3 0

3 years ago

Which of the following best demonstrates the effect of static friction? A. A person dropping a ball to the ground. B. A person p

Dominik [7]

Answer:

Explanation:

A person pushing a couch will face resistive force of friction . When resistive force is greater then his force of effort , couch will not move. This force is static friction because the couch is stationary. When the force of effort is increased , magnitude of static friction also increases keeping the couch stationary. The ability of the static friction to increase its magnitude is limited by a maximum value beyond which the couch starts moving. The static friction is then converted into kinetic friction.

In rest of the three cases object is already moving so kinetic friction is in action.

6 0

3 years ago

Suppose a 1 Gbps point-to-point link is being set up between the Earth and a new lunar colony. The distance from the moon to Ear

vagabundo [1.1K]

Answer:

The time required to send the data from Earth to Moon will be 1.28s while for a two way communication, to send it back to the earth, it will take double time i.e. RTT = 2.56s

Explanation:

Distance between Earth and Moon = 385,000 km = 3.85 x 10⁸m

Speed of data travel = speed of light ≈ 3 x 10⁸m/s

As, v=d/t

t=d/v

$t=\frac{3.85*10^{8} }{3*10^{8}}$

t=1.28s

RTT = Double of single way time taken = 2x1.28

RTT=2.56s

7 0

3 years ago