Radio telescopes can sometimes detect stars which are behind dust clouds. a. True
b. False

Answers

Answer 1

Answer: The answer is A.True

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At what speed must a 950-kg subcompact car be moving to have the same kinetic energy as a 3.2×104−kg truck going 20 km/h?

Answers

Answer:

950-kg subcompact car be moving to have the same kinetic energy of truck at 116.08 km/hr

Explanation:

Kinetic energy of body with mass m and moving at velocity v is given by

$KE=(1)/(2) mv^2$

KE of truck $= (1)/(2)*3.2*10^4*20^2$

KE of subcompact car $= (1)/(2)*950*v^2$

Equating

$(1)/(2)*3.2*10^4*20^2= (1)/(2)*950*v^2\n \n v=116.08 km/hr$

So 950-kg subcompact car be moving to have the same kinetic energy of truck at 116.08 km/hr

Final answer:

To have the same amount of kinetic energy as a 3.2x10^4kg truck moving at 20km/h, a 950-kg subcompact car would need to be moving at an approximate speed of 224 m/s.

Explanation:

The problem requires us to calculate the speed that a 950-kg car must achieve to have the same kinetic energy as a 3.2×104-kg truck moving at 20 km/h. The kinetic energy of an object is represented by the equation K = 0.5mv² where m signifies mass and v speed.

The truck's kinetic energy can be calculated using this formula: Ktruck=0.5(3.2×104kg)(20 km/hr * 1000 m/km / 3600 s/hr)² = 1.96 x 107 J.

For the car to have the same kinetic energy, we set up the following equation and solve for v: 1.96 x 107 J = 0.5(950 kg)v², yielded v = 224 m/s.

Thus, the subcompact car needs to move at a speed of 224 m/s to have the identical kinetic energy as the truck moving at 20 km/h.

Learn more about kinetic energy here:

brainly.com/question/26472013

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When a baseball player catches a baseball, the glove "gives" or moves backward. How does this movement affect the change in momentum of the baseball? The change in momentum increases because the impact time increases. The change in momentum decreases because the force decreases. The change in momentum stays the same because the ball still comes to a stop. The change in momentum depends on the initial speed of the ball and the time to stop.

Answers

Answer:

The change in momentum increases because the impact time increases.

Explanation:

The change in momentum of an object is also called impulse (J), and it is equal to

$J=F \Delta t$

where

F is the force applied to the object

$\Delta t$ is the time taken for the change in momentum of the object to occur (the impact time)

From the formula above, we can notice that:

- the larger the force, the larger the change in momentum

- the larger the impact time, the larger the change in momentum

In the example of the baseball caught by the glove, when the glove moves backward, the time taken for the ball to stop increases (due to the movement of the gloves). Looking at the formula, we see that this means that the impulse (the change in momentum) increases.

Answer:

The change in momentum stays the same because the ball still comes to a stop.

Explanation:

here we know that momentum is defined as the product of mass and velocity

so here we know that

$P = mv$

now we know that formula to find the change in momentum is given as

$\Delta P = mv_f - mv_i$

$\Delta P = m(v_f - v_i)$

now when player moves his hand backwards then in this case final speed of the ball is zero and initial speed is same

So here we can say that there is no change in the equation but only the the to stop the ball is increased.

So here change in momentum will remain the same

The velocity of a car changes from 20 m/s east to 5 m/s east in 5 seconds. What is the acceleration of the car?

Answers

To solve this remember a=change in v/t, assuming the direction for the velocity, is + positive east. You can calculate it simply by this. A=v/t= A=5-20/5= A=-15/5= A=-3m/s squared. Change in velocity= vf-vi.

Question 17 ListenA blue lab cart is traveling west on a track when it collides with and sticks to a red lab cart traveling east. The magnitude of the momentum of the blue cart before the collision is 2.0 kilogram • meters per second, and the magnitude of the momentum of the red cart before the collision is 3.0 kilogram • meters per second. The magnitude of the total momentum of the two carts after the collision is1.0 kg • m/s2.0 kg • m/s3.0 kg • m/s5.0 kg • m/s

Answers

Answer:

option A

Explanation:

given,

momentum of blue car in west direction = Pa = 2 kg.m/s

momentum of red cart in east direction = Pb = 3 kg.m/s

total momentum of the two cart = ?

Pa = 2 Kg.m/s

Pb = -3 kg.m/s

Total momentum

P = Pa + Pb

P = 2 - 3

P = - 1 kg.m/s

hence, the total momentum of the two carts after the collision is 1.0 kg•m/s

The correct answer is option A

What is a time paradox?

Answers

Hey There Wolfie,

What is a time paradox?

A temporal paradox, time paradox, or time travel paradox is aparadox, an apparent contradiction, or a logical contradiction that is associated with the idea of time and time travel. Temporal paradoxesfall into two broad groups: consistency paradoxes exemplified by the grandfather paradox; and causal loops

Why is net force a vector sum A.All forces have direction and magnitude B.Forces can only be attractive C.All forces are contact forces D.There are four fundamental forces