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3 years ago

The answer please it’s very simple this is 7th grade science

Physics

2 answers:

olganol [36]3 years ago

7 0

Answer:

Kinetic Energy

Explanation:

The explanation is the cart is moving and the people are not so the answer is kinetic energy.

allochka39001 [22]3 years ago

3 0

The greatest point for kinetic is at the bottom and in the middle it is in half and at the top it is at the highest in potential energy.

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Which has the greater acceleration

Alik [6]

Answer: Object B

The velocity of object A is depicted in the graph as a straight line (constant speed therefore no acceleration).
The graph indicates that the velocity of object B increases (the object is accelerating).

5 0

3 years ago

A 50-V de voltage source was connected in series with a resistor and capacitor. Calculate the current in A to two significant fi

Naddik [55]

Answer:

Current through circuit will be $0.2706\times 10^6A$

Explanation:

We have given source voltage v = 50 volt

Resistance $R=25Mohm=25\times 10^6ohm$

Capacitance $C=0.1\mu F=0.1\times 10^{-6}F$

Time t = 5 sec

Time constant of RC circuit is given by $\tau =RC=25\times 10^6\times 0.1\times 10^{-6}=2.5sec$

We know that voltage across capacitor is given by $v_c=v_s(1-e^{\frac{-t}{\tau }})$

$v_c=50(1-e^{\frac{-5}{2.5 }})=43.2332v$

So current will be $=\frac{v_s-v_c}{R}=\frac{50-43.2332}{25\times 10^{-6}}=0.2706\times 10^6A$

So current through circuit will be $0.2706\times 10^6A$

4 0

4 years ago

The _______ is the coldest layer of the atmosphere

n200080 [17]

The mesosphere is the coldest layer of the atmosphere. It is located above the stratosphere.

4 0

3 years ago

Which statement is always true about objects which exert gravitational force on each other? (3 points)

kumpel [21]

Answer:

They have mass is always true.

8 0

3 years ago

A car is traveling north at 17.7m/s After 12 s its velocity is 14.1m/s in the same direction. Find the magnitude and direction o

dem82 [27]

Answer:

Option B

0.3 m/s2 South

Explanation:

Acceleration, $a=\frac {v-u}{t}$ where v and u are final and initial velocities respectively, t is the time taken

Substituting 14.1 m/s for v, 17.7 m/s for u and 12 s for t then

$a=\frac {14.1 m/s- 17.7 m/s}{12}=-0.3 m/s^{2}$

Since this is negative acceleration, it's direction is opposite hence 0.3 m/s2 South

7 0

3 years ago