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Question1
A uniform bar of length 46 m and mass 3 kg is attached to a wall with a hinge that exerts a horizontal force Hx and a vertical force Hy on the bar. The bar is held by a cord that makes a 90 angle with respect to the bar and 44 with respect to the wall. What is the magnitude of the horizontal force Hx on the pivot? The acceleration of gravity is 9.8 m/s2.
Answer in units of N
Question2
A 39.0-kg child swings in a swing supported by two chains, each 2.98m long. The tension in each chain at the lowest point is 440 N.
(a) Find out the child's speed at the lowest point.
(b) Find out the force exerted by the seat on the child at the lowest point.
Question3
A spring with a force constant of 135 N/m is used to push a 0.27-kg block of wood against a wall. Find out the least compression of the spring needed to keep the block from falling, given that the coefficient of static friction between block and wall is 0.39.
Two tugboats pull a disabled supertanker. Each tug exerts a constant force of 1.90×106 N, one at an angle 12.0 degrees west of north, What is the total work done by the two tugboats on the supertanker
Vector A is in the direction 44.0 clockwise from the negative y-axis. The x-component of is = -19.0 What is the -y component of A? What is the magnitude of A.
A shopper pushes a cart 49 m south down one aisle and then turns 90.0° west and moves 11 m. What is the smallest possible displacement of the shopper
A rope pulls on the lower block in the figure with a tension force of 20 N. What is the acceleration of the 2.0 kg block
The plates of a parallel-plate capacitor have a separation of 4.04mm , and each has an area of 15.4cm2 . Each plate carries a charge of magnitude 6.65×10?8C, What is the potential difference between the plates
A partially evacuated airtight container has a tight-fitting lid of surface area 75.4 cm2 and negligible mass. If the force required to remove the lid is 384 N and the atmospheric pressure is 1.00 × 105 Pa, what is the air pressure in the containe..
he density of free electrons in gold is 5.90x10^28 m^-3. The resistivity of gold is 2.44x10^-8 ohms.m at a temperature of 20 C, what is the drift velocity of the electrons in the wire
What is the magnitude of the torque about the point where the beam is bolted into place.
A car is travelling at a constant speed of 32m/s on a highway. At the instant this car passes an entrance ramp, a second car enters the highway from ramp.
Two resistors A and B are 60,000 and 40,000 (omega sign) respectively and are in series across a constant power supply of 100V. What amount of current is flowing in each of the 3 resistors
a car traveling 85km/h strikes a tree. the front end of the car compresses and the driver come to rest after traveling 0.80m
An Otto cycle has the lowest temperature at 290 K and the lowest pressure at 85 kPa. How much power does it produce
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