At what speed does a 1900 kg compact car have the same kinetic energy as a 2.00×104 kg truck going 24.0 km/hr ?

Express your answer with the appropriate units.

A toy cannon uses a spring to project a 5.38-g soft rubber ball. The spring is originally compressed by 4.91 cm and has a force constant of 8.08 N/m. When the cannon is fired, the ball moves 15.6 cm through the horizontal barrel of the cannon, and the barrel exerts a constant friction force of 0.032 6 N on the ball.

(a) With what speed does the projectile leave the barrel of the cannon? m/s

(b) At what point does the ball have maximum speed? cm (from its original position)

(c) What is this maximum speed? m/s

Sketch position of Moon several times in a single night(can draw a horizontal sketch)

See the answer

Your supervisors at A&L Engineering have tasked you with evaluating the durability of three common materials used in the design of cell phone cases. For each material type, you have been asked to determine the force of impact of a phone dropped from a set height above the ground. Using the mass of each case and the collision time, determine the force of impact on each case material and determine which case material offers the most protection.

To facilitate your analysis, you have been provided with specifications for case materials in the table below. However, you may also use your own figures for the mass of phones and test case materials. If you do use a different figure, be sure to make that clear in your analysis. As you use this data, ensure that you have made the necessary SI unit conversions:

Test MaterialMassCollision TimePhone Only (No Case)6.2 oz.0.01 secondsSilicone1.7 oz.0.05 secondsHard Plastic1.1 oz.0.03 secondsRubber3.2 oz.0.08 seconds

Directions

To complete your evaluation of various materials for cell phone cases, you must create a case material evaluation report that describes the motion and impact forces of several phone case materials under evaluation.

Once you have described the relevant laws of motion, create force diagrams to model the motion for a phone dropped from a set height. You should include diagrams, with their respective force vectors, for each phone drop. In your diagrams, address the following:

Define the height you will be using for each phone drop. As the researcher, you will choose a drop height of between 1 and 2 meters.

Using the provided mass of 6.2 oz, or by measuring the mass of a personal cell phone, determine the mass you will be using for your calculations. Remember to add the mass of the case material.

In your diagram, show the direction and name of each force on the cell phone both at the drop point and at the point of collision with the ground.

Following the creation of the force diagram, use the information provided in your case specification document to calculate the velocity before impact and deceleration at impact. Remember that deceleration is represented as negative acceleration in force equations. In your calculations, assume a standard free-fall acceleration during the fall, and a velocity of 0 m/s after the impact. You should include calculations for the following scenarios:

A phone without a case

A phone with a silicone case

A phone with a hard plastic case

A phone with a rubber case

Using Newton’s second law, calculate the force of impact for each scenario.

After you have completed your calculations, describe how force equations model the given scenario. In your description, address the following elements:

Velocity before impact

Acceleration

Force

Finally, using data from your analysis, recommend the best material for a cell phone case. In your recommendations, address the following elements:

Which of the trials results in the lowest force of impact on the phone?

What considerations, in physics or otherwise, might you have in recommending a material for a cell phone case?

Can a person, in principle, travel from Earth to the galactic center (which is about 2.30

It is always a good idea to understand the "size" of units. The objects listed below are resting on a hard surface. Categorize each object according to the pressure it exerts on the surface when placed on their side with the largest area, which is the bottom. Assume that the bottom of each object is flat and that the pressure refers to that above atmospheric pressure (that is, gauge pressure). Use common sense estimates, make your own measurements and/or do a little research to determine the relevant dimensions and weights of the objects.

Determine the Pressure of a

brick

sheet of paper

textbook

penny

can of soup

Is the following equation dimensionally correct?

v= sqrt(pH/PE)

v= feet per second

p = grams per cubic cm

H = height in feet

PE = joules

Discuss Fermi theory of Beta Decay in detail?
and what do you mean by nuclear isomerism in Nuclear Physics?

1)

A homogeneous solid object floats on water with 78% of its volume below the surface. The same object when placed in a second liquid floats on that liquid with 71% of its volume below the surface.
Determine the density of the object.

2)

Determine the specific gravity of the liquid.

Question 5.
A nailing gun produces a short, loud sound as the tool drives in a nail. The sound has an intensity
level of 136 dB at the ear of the user (0.2 m from the tool), for a duration of 0.1 s.
(a) What is the corresponding sound intensity? (1.5 marks)
(b) The tool is a good approximation to a point source of sound. What is the rate at which it
produces sound energy? (1.5 marks)
(c) How much energy would be transported to the user’s eardrum (of area 6.0 x 10-5 m2) as the
tool drives in a nail? (1.5 marks)
(d) Explain why earplugs or earmuffs are recommended to be worn when using the tool.
(0.5 mark)

A 36 V battery of negligible internal resistance is connected to a 47 kΩ and a 21 kΩ resistor in series.

a).

What reading will a voltmeter, of internal resistance 95 kΩ , give when used to measure the voltage across the first resistor?

Express your answer using two significant figures.

V47 kΩ=

b).

What is the percent inaccuracy due to meter resistance for each case?

Express your answer using two significant figures.

V not ideal−V ideal/V ideal=

c).

What reading will a voltmeter, of internal resistance 95 kΩ , give when used to measure the voltage across the second resistor?

Express your answer using two significant figures.

V21 kΩ=

d).

What is the percent inaccuracy due to meter resistance for each case?

Express your answer using two significant figures.

V not ideal−V ideal/V ideal=

4) A planet is orbiting a star at a distance of 1.20 × 1011 m with a period of 0.750 Earth years. What is the acceleration of the planet?

5) A fan is rotating at a constant 360.0 rev/min. What is the magnitude of the acceleration of a point on one of its blades 10.0 cm from the axis of rotation?

6) A particle travels in a circular orbit of radius 10.0 m. Its speed is changing at a rate of 15.0 m/s2 at an instant when its speed is 40.0 m/s. What is the magnitude of the acceleration of the particle?

In a single slit experiment, the central maximum is:

Electrons would be ejected from silver if the incident light had a frequency of:

What is the mass equivalent of an x-ray with a frequency of 5.63 x 1017 Hz?

Tennis balls traveling at greater than 100 mph routinely bounce off tennis rackets. At some sufficiently high speed, however, the ball will break through the strings and keep going. The racket is a potential-energy barrier whose height is the energy of the slowest string-breaking ball. Suppose that a 100 g tennis ball traveling at 220mph is just sufficient to break the 2.0-mm-thick strings. Estimate the probability that a 150mph ball will tunnel through the racket without breaking the strings.

Give your answer as a power of 10 rather than a power of e.