In the equation for the gravitational force between two objects, which quantity must be syuu

A highway patrolman traveling at the speed limit is passed by a car going 20 mph faster than the speed limit. After one minute,

Oksi-84 [34.3K]

Answer:

It will take 40 seconds to catch the speeding car

Explanation:

Initial speed of the patrolman = 55 mph

after one minute speed of patrol man = 115 mph

now acceleration of patrolman is given by

$a = \frac{v_f - v_i}{t}$

$a = \frac{115 - 55}{1/60} = 3600 m/h^2$

now at this acceleration the distance covered by patrolman in "t" time is given as

$d = v_i t + \frac{1}{2}at^2$

$d = 55t + 1800t^2$

now we know the speed of the speeding car is given as

$v' = (55+20) mph$

now in the same time distance covered by it

$d = 75 t$

now since the distance covered is same

$75 t = 55t + 1800 t^2$

$t = \frac{20}{1800} = \frac{1}{90} h$

$t = 40 seconds$

7 0

4 years ago

Read 2 more answers

An airplane has mass of 5,320 kg. At takeoff, how much lift force is necessary to accelerate the plane upward at a rate of 1.40m

Ira Lisetskai [31]

Answer:

59637.2 N force is required to lift the plane upward.

Explanation:

Mass of the aeroplane (m) = 5320 kg

Acceleration of the plane upward at a rate (a) = 1.40 m/s

"Newton's second law of motion", F - R = ma, where, "force" (F) acting on an object, (R) "resistive force", "mass" (m) of an object and "acceleration" (a).

Force = Resistive force + (mass × acceleration)

Resistive force = mass of an object × acceleration due to gravity. ( we know that acceleration due to gravity is $\left.9.8 \mathrm{m} / \mathrm{s}^{2}\right)$

Resistive force = 5320 × 9.81

Resistive force = 52189.2 N

Force = 52189.2 + (5320kg × 1.40 m/s)

Force = 59637.2 N

At takeoff, 59637.2 N force is necessary to accelerate the plane upward at a rate of 1.40 m/s .

7 0

3 years ago

The men's world record for swimming 1500.0 m in a long course pool (as of 2007) is 14 min 34.56 s. At this rate, how many second

swat32

Answer:

797.41 s

Explanation:

0.850 mile = 1609 x .85 m

= 1367.65 m

14 min 34.56 s

= 14 x 60 + 34.56 s

= 874.56 s

Speed of swimming = Distance / time

= 1500 / 874.56

= 1.7151 m /s

Time to swim a distance of 1367.65 m

= Distance / speed

= 1367.65 / 1.7151

= 797.41 s

7 0

4 years ago

Jamal is taking an introductory psychology course. One afternoon Jamal explains to his mother that punishment can lead to unwant

Lena [83]

Answer:

The answer is letter D, hindsight bias.

Explanation:

A hindsight bias occurs when a person starts stating something that was contradictory to what he said earlier. This is also known as the "I-knew-it-all-along phenomenon." In this case, the person also states that he already knew what the outcome would be, even before it was predicted.

So, in the situation above, Jama's mother is clearly demonstrating the hindsight bias. Her earlier opinion that "people should receive greater punishment as children" contradicted her approval of Jama's opinion that "punishment can lead to unwanted results and have a lasting impact on someone." By saying, "I knew that!" Jama's mother clearly overestimated her ability to predict the outcome.

Thus, this explains the answer, letter D.

8 0

3 years ago

A hockey player has an acceleration of −3.1 m/s2. How long does it take him to come to a complete stop from a speed of 13 m/s?

ddd [48]

Use this formula:

final speed = initial speed + acceleration * time
0 = 13 - 3.1*t, t = 13/3.1 = 4.19354838709677 s = 4.2 seconds, might be enough since ur given 1 decimal place precision

6 0

3 years ago