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Archy [21]
4 years ago
8

A 14.0 kg cart is coasting down a street at a steady speed of 7.00 m/s. what is the kinetic energy of the cart?

Physics
1 answer:
Orlov [11]4 years ago
3 0
I had this question before can you show me the answer choices
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The froghopper, Philaenus spumarius, holds the world record for insect jumps. When leaping at an angle of 58.0° above the horizo
Norma-Jean [14]

Answer:

0.528m

Explanation:

a)58.7 cm = 0.587 m

Let g = 9.8m/s2. When the frog jumps from ground to the highest point its kinetic energy is converted to potential energy:

E_p = E_k

mgh = mv^2/2

where m is the frog mass and h is the vertical distance traveled, v is the frog velocity at take-off

v^2 = 2gh = 2*9.8*0.587 = 11.5

v = \sqrt{11.5} = 3.4 m/s

b) Vertical and horizontal components of the velocity are

v_v = vsin(\alpha) = 3.4sin(58^0) = 2.877 m/s

v_h = vcos(\alpha) = 3.4cos(58^0) = 1.8 m/s

The time it takes for the vertical speed to reach 0 (highest point) under gravitational acceleration g = -9.8m/s2 is

\Delta t = \Delta v / g = \frac{0 - 2.877}{-9.8} = 0.293s

This is also the time it takes to travel horizontally, we can multiply this with the horizontal speed to get the horizontal distance it travels

s_h = v_ht = 1.8*0.293 = 0.528 m

3 0
3 years ago
Suppose you display a 1 kHz, 2 V sine wave in channel A and a DC, 1V signal in channel B with sensitivities set on 1V/div. You s
defon

Answer:

You are going to see the AC functions shifted down

Explanation:

Because you had a positive DC signal first, you had to readjust the position to the middle, otherwise, the sum of AC and DC would have been shifted up; because of this, your cursor has been moved down and ones the DC disappears from channel B the signal will be shifted down.

Note: Changing from DC to AC in channel B will kill all the DC signal

5 0
3 years ago
Which of the following would occur when the number of coils is increased
Andrew [12]
Voltage is increased, i think.
6 0
4 years ago
A car completes a journey in 2 hours. Its average speed over this journey was 45 mph. Calculate the distance travelled by the ca
atroni [7]
Answer:
90 miles

Explanation:
It is given that the time is 2 hours and the average speed as 45 mph. Hence the car completes a distance of 90 miles in 2 hrs.
4 0
3 years ago
The airplane hits even worse turbulence and you find yourself pinned against the ceiling of the airplane by a force of 100 N. Wh
brilliants [131]

Answer:

The correct answer is "12 m/s²".

Explanation:

Given:

F_{app} = 100 \ N

As we know,

⇒ F_{app} = mg-ma

Or,

⇒ a = g-(\frac{F_{app}}{m} )

By substituting the values, we get

⇒    =10-(-\frac{100}{50} )

⇒    =10+2

⇒    =12 \ m/s^2

8 0
3 years ago
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