Find the average reaction force for the corresponding time of contact on cushion material.
Answer to Problem 39P
The average reaction force for the corresponding time of contact is calculated and tabulated in Table 1.
Explanation of Solution
Given data:
Weight of the laptop
Laptop is dropped at a height
Formula used:
Formula to determine the average force is,
Here,
m is the mass of the object.
Formula to determine the initial velocity of the laptop right before the floor is,
Here,
g is the acceleration due to gravity.
h is the height at which laptop is dropped.
Formula to determine the mass of the laptop is,
Here,
w is the weight.
g is the acceleration due to gravity.
Calculation:
The cushion material reduces the velocity of the laptop to a final velocity of zero. Therefore,
Substitute
Substitute 22 N for w and
Substitute 0 for
Substitute 0 for
Reduce the equation as follows,
Substitute 0 for
Substitute 0 for
Substitute 0 for
Thus, the average reaction force for the corresponding time of contact is calculated and tabulated in table 1.
Table 1
Time of contact (Seconds) | The average reaction force (N) |
0.01 | 992N |
0.05 | 198N |
0.1 | 99.2 N |
1.0 | 9.92 N |
2.0 | 4.96 N |
Conclusion:
Hence, the average reaction force for the corresponding time of contact is calculated and tabulated.
Want to see more full solutions like this?
Chapter 10 Solutions
ENGINEERING FUNDAMENTALS W/ACCESS
- A structural member with a rectangular cross section as shown in the accompanying figure is used to support a load of 2500 N. What type of material do you recommend be used to carry the load safely? Base your calculations on the yield strength and a factor of safety of 2.0.arrow_forwardIn the figure below, the weight of the block is 300 kg and the angle of internal friction is 24.2 degrees. a. If h = 50 cm and P = 50 kg. does the block move? b. If h = 50 cm, what is the smallest P to start motion?arrow_forwardIn the figure below, the weight of the block is 300 kg and the angle of internal friction is 24.2 degrees.a. If h = 50 cm and P = 50 kg. does the block move?b. If h = 50 cm, what is the smallest P to start motion?arrow_forward
- A cylindrical container 9 meters high and 2.5 meters in diameter is reinforced with twohoops as shown in the figure. When it is filled with fluid at 5m high, what is thetension in the top hoop due to fluid?arrow_forwardfluıd mechanıcs If an oil tank is pulled uphill on a surface that makes an angle of 162 with the horizontal, the oil makes an angle of 160,a) Show the forces acting on the tank on the figure. Write the balance of force.b) Calculate the constant acceleration of the tank being pulled uphill.arrow_forwardA block in the following figure is pulled up with a Force 20 +S Nt. The weight of the block is 10 Nt. The area of the contact surface between the block and fluid is 10 cm2. a)find the velocity of the block if the fluid is an ideal fluid b)find the velocity of the block if dynamic viscosity of the Fluid between the block and inclined surface in the figure is 0.2 Nt.s/m2. (S=4)arrow_forward
- In a laboratory experiment, a two‐fluid differential manometer is used to measure the pressure drop for a flowing process fluid, a silicone oil that is immiscible with water, as shown in Figure 2. Determine the pressure drop between Points A and B if h1 = 500 mm, h2 = 190 mm, and h3 = 275 mm. The densities of the process fluid and water are 1060 kg/m3 and 1000 kg/m3 respectively.arrow_forwardA frame shown in the figure consists of a horizontal rigid bar that is supported by two concrete columns. The temperature of system is increased by ΔT= 90 °C. Assume α1 = 7.5 x10-6/°C, α2 = 13 x10-6/°C, a = 290 mm, and L = 270 mm Determine the angle of rotation if the temperature of system is increased by ΔT? In micro radarrow_forwardIn a falling ball viscometer, a steel ball 1.2 mm in diameter is allowed to fall freely in a heavy oil having s= 0.802. The Steel specific weight is 77 kN/m3. If the ball observed to fall 250 mm in 10.4 seconds, calculate the viscosity of the oil?arrow_forward
- QUESTION 4: Made of a smooth material and a beam of constant cross section with two springs at ends A and B is supported. Both springs as constant k given. Any object on the beam vertical oscillation period 0.83 seconds. An object with a mass of 50 kg vertical oscillation when placed in the center period increases to 1.52 seconds. Both the stiffness of the spring and the mass of the beam Calculate.arrow_forwardA 100-ft long dam holds 30 ft of water as shown in the figure. Using the panel equations, determine the hydrostatic force (in kips) acting on the dam. Determine the moment of inertia of the wetted surface of the dam. Your answer should be in ft^4. Determine the eccentricity in feet. At what distance from the bottom of the dam (along the surface of the dam) is the hydrostatic force acting? Your answer should be in feet.arrow_forwardPlease show the complete solution. (Example: Conversion of Units) A rigid container is closed at one end and measures 8 in diameter by 12 in long. The container is held vertical and is slowly moved downward until the pressure in the container is 17 psia. What will be the depth of the top of the container from the free water surface?arrow_forward
- Engineering Fundamentals: An Introduction to Engi...Civil EngineeringISBN:9781305084766Author:Saeed MoaveniPublisher:Cengage Learning