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shepuryov [24]
3 years ago
14

Maria drove to the store and then to work.

Physics
1 answer:
natali 33 [55]3 years ago
8 0

Answer: C - 60km !!!

Explanation:

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A rocket lifts off the pad at cape canaveral. according to newton's law of gravitation, the force of gravity on the rocket is gi
Alenkinab [10]
The equation is the Law of Universal Gravitation. The gravitational constant G is equal to 6.67×10⁻¹¹ Nm²/kg². The mass of the Earth is <span>5.972 ×10</span>²⁴ kg. Compared to the mass of the Earth, the mass of the rocket is negligible. So, we don't need to know the mass of the rocket. Substituting the values:

F = (6.67×10⁻¹¹ Nm²/kg²)(5.972 ×10²⁴ kg)/(4000 miles*(1.609 km/1mile))²
F = 9616423.08 N

The work is equal to
W = Fd
W = (9616423.08 N)(2000 miles*1.609 km/mile)
W = 9.095×10¹⁰ Joules
8 0
4 years ago
What is the speed of a 0.2 kg baseball if its kinetic energy is 40 j?
prohojiy [21]

The kinetic energy of an object is given by:

K=\frac{1}{2}mv^2

where m is the mass of the object and v its speed. The ball in this problem has a mass of m=0.2 kg and a kinetic energy of K=40 J, so we can rearrange the previous equation to find its speed:

v=\sqrt{\frac{2K}{m}} =\sqrt{\frac{2 \cdot 40 J}{0.2 kg}}=20 m/s

4 0
3 years ago
What Layer of the Earth is composed of Fe and Ni
ohaa [14]
I believe the answer is the core.
6 0
3 years ago
A car went 60 km in 5/6 of an hour while a second car went 54 km in 2/3h. Which car was faster? How many times faster?
Nastasia [14]

Answer:

The car that went 54 km in 2/3h was faster, 5/4 times faster than the other car

Explanation:

Average speed of a car is the ratio between the displacement \Delta x and the time (t) it takes to do that displacement:

V_{avg}=\frac{\Delta x}{t}

So, for the first car:

V_{avg1}=\frac{60km}{\frac{5h}{6}} =72\frac{km}{h} (1)

for the second car we have:

V_{avg2}=\frac{60km}{\frac{2h}{3}} =90\frac{km}{h} (2)

So, the second cart is faster than the first one. To find how many times divide speed 2 by speed 1:

\frac{90}{72}=\frac{5}{4}

4 0
3 years ago
In each cycle, a heat engine receives an input of 1540 J of heat and exhausts 1030 J of heat. What is the thermal efficiency?
Katarina [22]

The thermal efficiency of a combustion system is simply the ratio of heat out and heat in, that is:

efficiency = heat out / heat in

efficiency = 1030 J / 1540 J

efficiency = 0.669

 

<span>So the efficiency is 0.669</span>

3 0
3 years ago
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