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Evgesh-ka [11]
3 years ago
6

A prisoner tries to escape from a Nashville, Tennessee prison by hiding in the laundry truck. The prisoner is surprised when the

truck is stopped at the gate. A guard enters the truck and handcuffs him. "How did you know I was here?" the prisoner asks. "The heartbeat detector," says the guard.A heartbeat detector senses the tiny vibrations caused by blood pumped from the heart. With each heartbeat, blood is pumped upward to the aorta, and the body recoils slightly, conserving the momentum of the blood-body system. The body's vibrations are transferred to the inside of the truck. Vibration sensors on the outside of the truck are linked to a geophone, or signal amplifier, attached to a computer. A wave analyzer program in the computer compares vibration signals from the truck to wavelets produced by heartbeat vibrations. The wave analyzer distinguishes a person's heartbeat from other vibrations in the truck or in the surrounding environment, allowing guards to detect the presence of a human in the truck.What does the heartbeat detector sense?1-Electric signals caused by electric dipole charges produced on the heart.2-Body vibrations caused by blood pumped from the heart.3-Sound caused by breathing.4-Slight uncontrollable reflexive motions of an enclosed person.5-All of the above
Physics
1 answer:
VARVARA [1.3K]3 years ago
3 0

Answer:

2. Body vibrations caused by blood pumped from the heart.

Explanation:

From the passage, it can be deduced that the heartbeat detector senses the tiny vibrations caused by blood pumped from the heart.

The prisoner asked the guard, "How did you know I was here?"

The guard responded,

"The heartbeat detector,"

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Answer:

Explanation:

Hello friend!!!

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2 years ago
Suppose a gliding 2-kg cart bumps into, and sticks to, a stationary 5-kg cart. If the speed of the gliding cart before the colli
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Answer:

Therefore,

Final velocity of the coupled carts after the collision is

v_{f}=4\ m/s

Explanation:

Given:

Mass of  Glidding Cart = m₁ = 2 kg

Mass of Stationary Cart = m₂ = 5 kg

Initial velocity of Glidding Cart = u₁ = 14 m/s

Initial velocity of Stationary Cart = u₂ = 0 m/s

To Find:

Final velocity of the coupled carts after the collision = v_{f}=?

Solution:

Law of Conservation of Momentum:

For a collision occurring between two objects in an isolated system, the total momentum of the two objects before the collision is equal to the total momentum of the two objects after the collision.

It is denoted by "p" and given by

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Hence by law of Conservation of Momentum we hame

Momentum before collision = Momentum after collision

Here after collision both are stuck together so both will have same final velocity,

m_{1}\times u_{1}+m_{2}\times u_{2}=(m_{1}+m_{2})\times v_{f}

Substituting the values we get

2\times 14 + 5\times 0 =(2+5)\times v_{f}

v_{f}=\dfrac{28}{7}=4\ m/s

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Final velocity of the coupled carts after the collision is

v_{f}=4\ m/s

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The center on a high school basketball team wants to increase the maximum height of his jump. What statement correctly describes
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Jumping with more acceleration

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