12,762 Answered Questions for the topic physics

Physics

10/27/22

Ultrasound probes can resolve structural details with sizes

Ultrasound probes can resolve structural details with sizes approximately equal to the wavelength of the ultrasound waves themselves. What is the size of the smallest feature observable in human... more
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Physics

10/27/22

Find the speed of the car before the collision.
An aggressive driver of a car moving west runs a red light. He collides in the middle of the intersection with an SUV that was moving north at 17.3 m/s. The two vehicles smash together and move at... more
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Physics

10/27/22

Find the mass, in metic tons, of the second car.
A train car with mass 37.0 metric tons rolls on a track with a speed of v1 = 3.72 m/s. It collides and couples with a stationary car. After the collision, the two cars rolls together with a speed... more
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Physics

10/26/22

A football player runs down a field for 26 m, the turns right at 17 degrees to run another 15 m. What is the magnitude of his total displacement and the angle he runs?
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Physics

10/26/22

A ball thrown vertically upward is caught by the thrower after 1.63 s. Find the maximum height the ball reaches. he acceleration of gravity is 9.8 m/s

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Physics

10/26/22

another scheme to catch the roadrunner has failed
a safe falls from rest from the top of a 36.4 m high cliff toward wiley coyote, who is standing at the base. wiley first notices the safe after it has fallen 10.5 m. how long does he have to get... more
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10/25/22

Find the magnitude and direction of the acceleration of a 500 kg elevator supported by a cable with a tension of 3000 N.
Solve a numerical "elevator problem" for the tension of an elevator cable or the acceleration of an elevator.
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10/25/22

A 3 kg object is sliding to the left on a surface with a coefficient of friction of 0.2 at an initial velocity of 15 m/s. Determine the magnitude and direction of the acceleration of this object.
Calculate the acceleration of an object sliding on a flat rough surface (meaning there is friction).
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10/25/22

An elevator is descending at a velocity of -2 m/s with an acceleration of +3.0 m/s^2 .

In this "elevator problem" with known velocity and acceleration, you must construct a free-body diagram of the elevator or the person inside and state whether the velocity is increasing or decreasing. more
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Physics

10/25/22

Work and Power Relationship.
A block of mass 4.43kg4.43kg is moving horizontally as a force of 263N, directed at 30.0∘30.0∘ above the horizontal, is exerted on it. When its speed is 7.76ms , what is the rate at which the force... more
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Physics

10/25/22

A ball thrown at a brick wall approaches the wall at +40 m/s and, after striking the wall, bounces back at −40 m/s. What change in velocity did the ball experience?
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Physics

10/25/22

velocity can either be positive or negative, depending on the direction of the displacement. the (change t), is always positive. why?
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Physics

10/25/22

40.00 off coupon

Had first session today. Try to enter the $40 coupon and the system is not accepting it.
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Physics

10/24/22

help in physics
As a gasoline engine is running, an amount of gasoline containing 12,000 J of chemical potential energy is burned in 1 s. During that second, the engine does 4,000 J of work.(a)What is the engine's... more
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Physics

10/24/22

i cant find the answer
A machinist wishes to insert a brass rod with a diameter of 7 mm into a hole with a diameter of 6.998 mm. By how much would the machinist have to lower the temperature (in °C) of the rod to make it... more
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Physics

10/24/22

Please help me!
A child in a boat throws a 5.65 kg package out horizontally with a speed of 10.0 m/s.  Calculate the velocity of the boat immediately after, assuming it was initially at rest. The mass of the... more
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Physics

10/24/22

Please help me!
A 0.150 kg baseball pitched at 40.0 m/s is hit on a horizontal line drive straight back at the pitcher at 50.0 m/s.a) If the contact time between bat and ball is 3.90 ×10−3 s, calculate the... more
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Physics

10/24/22

Please help me !
A 15 kg hammer strikes a nail at a velocity of 8.5 m/s and comes to rest in 6.0 ms.a) What is the impulse given to the nail?  b) What is the average force acting on the nail?  Express answers using... more
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Physics

10/24/22

Please help me!

A 7100 kg boxcar traveling 12.0 m/s strikes a second car. The two stick together and move off with a speed of 4.60 m/s.  What is the mass of the second car?  Express your answer using three... more
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Physics

10/24/22

physics homework help
A circus performer is shot out of a cannon and flies over a vertical net that is places at a horizontal distance of 8.80m from the cannon. When the cannon is aimed at an angle of 40 degrees above... more
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Physics

10/24/22

Rotational Equilibrium and Rotational Dynamics
You turned on your classroom ceiling fan at its lowest setting. You measured that the rotation is 250 rev/min. When adjusted to its maximum setting, the speed increases to 450 rev/min in 15 s. (a)... more
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Physics

10/24/22

An aluminum wing on a passenger jet is 38 m long when its temperature is 28°C. At what temperature would the wing be 9 cm (0.09 m) shorter?
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Physics

10/24/22

i need help with this physics
As a gasoline engine is running, an amount of gasoline containing 12,000 J of chemical potential energy is burned in 1 s. During that second, the engine does 4,000 J of work.(a)What is the engine's... more
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Physics

10/24/22

i need some help in this questions

A machinist wishes to insert a brass rod with a diameter of 7 mm into a hole with a diameter of 6.998 mm. By how much would the machinist have to lower the temperature (in °C) of the rod to make it... more
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Physics Calculus

10/22/22

Find the instantaneous rate of change of the volume with respect to time.
The radius of a right circular cylinder is given by √(t + 2) and its height is 1/2√t,where t is time in seconds and the dimensions are in inches. Find theinstantaneous rate of change of the volume... more
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